Is the .300 BLK the Ultimate.....

[Wolfdog91]

Caliber for casting in the AR-15 platform ? Just a thought but looking through the various mold makers theirs more variety of .309-310 molds then just about everything else. Wanna RN Boolit , theirs like 50 options, wanna FN ? Even more , HP for hunting? Awhole lot ! Not to mention you can run the gamit if weights from like 110 all the way too 300 grains if I remember correctly. No to mention your usually shooting .300blk sub sonic anyhow so your already in that " happy spot" (1500fps and lower)for cast Boolits. It dosent use a ton of powder either. I mean if your just trying to do "average " cast shooting activities ( plinking, killing cans hunting @100yd and under) seems like it's one of the best options for casting in the AR platform. What do y'all think ? Again on the AR platform

[Burnt Fingers]

It's close. However getting an AR to run with cast boolits can sometimes be a challenge.

I also like 350 Legend and 7.62x39.

[M-Tecs]

I have heard of 247 grain in the 300 BLK. Not aware of anything as heavy a 300 grain.

For plinking, killing cans, hunting @100yd and under I like my .458 SOCOM.

I do not own a 300 BLK.

https://forum.castbulletassoc.org/thread/12376-heavyweight-cast-bullets-is-a-300-blackout/

[WinchesterM1]

I love the 300 blk I have a 16” upper a 8.5” upper on a pistol and a Ruger Ranch Rifle in 300blk it took me a lot of bullets to get one to feed(super tight throats) but once I did I shoot it a lot, I use the NOE 310-225 with lilgun and the HTC 310-130gc for my supers with H110 for around 220-2300fps.

When we travel I keep my 8.5” pistol in my trunk loaded with 4 different ammo in 4 different mags. You never know what may happen
279621

[cwtebay]

I love the 300 blk I have a 16” upper a 8.5” upper on a pistol and a Ruger Ranch Rifle in 300blk it took me a lot of bullets to get one to feed(super tight throats) but once I did I shoot it a lot, I use the NOE 310-225 with lilgun and the HTC 310-130gc for my supers with H110 for around 220-2300fps.

When we travel I keep my 8.5” pistol in my trunk loaded with 4 different ammo in 4 different mags. You never know what may happen
279621Gotta ask - #1) why in the trunk?
#2) why separate mags?

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[jimb16]

My 300BLK eats anything I have a .30 mold for. The worst accuracy I've gotten is 3 inches at 100 yards and that was in the initial stages of load development. The lightest I shoot is 115 gr. My heaviest is 247 Gr.

[brstevns]

The great thing is brass can be formed from 223 brass

[zarrinvz24]

I don’t own an AR so I don’t have a dog in this fight, but from some of my friends that are into the tacti-cool scene, 300 HAM’R is where it’s at. Several of them went so far as to say they wouldn’t have ever gotten the BLK if the HAM’R had been around at the time. So, no 300BLK is not the ultimate cast AR caliber.

I’ve heard good things about the 458 SOCOM, and I like the fact that the 10rd magazine is a standard sized AR mag. I bet everyone in the liberal strongholds love it for the same reason.

[dverna]

If I wanted a cast bullet AR, I would want the .358 based on the .223 case, not the .350 Legend.

The .300 BO has one issue....it can be chambered in a .223 gun and the result is unpleasant. One mistake is all it takes.

[GARD72977]

I don’t own an AR so I don’t have a dog in this fight, but from some of my friends that are into the tacti-cool scene, 300 HAM’R is where it’s at. Several of them went so far as to say they wouldn’t have ever gotten the BLK if the HAM’R had been around at the time. So, no 300BLK is not the ultimate cast AR caliber.

I’ve heard good things about the 458 SOCOM, and I like the fact that the 10rd magazine is a standard sized AR mag. I bet everyone in the liberal strongholds love it for the same reason.

I have no interest in the 300 HAMA'R. Everyone has there own intrest. I shoot the 300/221 in an encore and Contender with the case being made from 357max. I use 1/10 twist barrells. Eventually I want a 1/12 twist barrel for my AR. I dont like the fast twist barrells

[M-Tecs]

The 300 HAM’R's case is about .23 longer than the 300 BLK. That will limit your length of bullets. Most of the heavies will be a single shot only. As a hunting round with 150 grain bullets the 300 HAM’R has advantages. For heavier bullets and suppressed the 300 BLK has significant advantages over the 300 HAM’R.

http://castboolits.gunloads.com/showthread.php?368782-WOOOW!-the-300-Ham-r-!!!

[farmbif]

the only gun I ever got and after using it a bit said to myself, why what a waste of time, effort and money putting that thing together. I have no use or interest in subsonic, the 300 HAMR looks interesting but I aint going there either, already got a 6.8 in an ar that will put down whatever one of those bullets might hit.
but variety is the spice of life, whatever floats your boat, everyone has different wants, needs and desires

[Finster101]

I like the blackout. Getting an AR to cycle is not an issue at all unless you are fooling with subs and a can and then it isn't that tough. Plenty of info on it. If you load it in to a .223 as mentioned well that's Darwinism in action. Just my opinion.

[zarrinvz24]

The 300 HAM’R's case is about .23 longer than the 300 BLK. That will limit you to length of bullets. As a hunting round with 150 grain bullets the 300 HAM’R has advantages. For heavier bullets and suppressed the 300 BLK has significant advantages over the 300 HAM’R.

http://castboolits.gunloads.com/showthread.php?368782-WOOOW!-the-300-Ham-r-!!!

Those are good points, and it does make sense that 300BLK will afford one more choice in boolit selection.

[farmbif]

from what ive read one of the key aspects to the HAMR is the twist rate, you cannot just rechamber a blackout and get HAMR performance. because of the twist rate I would think the HAMR would be an ideal platform for cast bullets

[tai95]

I had a 300BLK and it was a headache. Just could never get it to run right. Got rid of it when it was the in thing and made back all I had into it plus a few bucks. Put that into a 50 Beowulf and never have had any reason to go back to the 300BLK. I may or may not have a 223 wylde, 50 beowulf, and an ar10 in 308. I have no need for anything else at the moment, or do I?

[Greg S]

50 Beowulf here. I see more in the 6.5G than the 300B but that has diminished greatly with the price of bullets.

[Finster101]

It's like anything else most love it or hate it. I never had a problem getting mine to run with supers at all. Subs require the right boolit to feed. Some noses are just too blunt and the right powder. Once I got the right mold and 1680 I was good to go.

[WinchesterM1]

Gotta ask - #1) why in the trunk?
#2) why separate mags?

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#1, in the trunk because we travel a lot and you would be surprised at some of the gas stations I have had to get gas in, last year it’s outside of Wilson NC I got blocked in by some gangsters that showed me his “piece” (Bryco 9mm) so I popped my trunk and showed him mine... I also keep my 72hr kit in my trunk with my bullet proof backpack... I figure if I need to the wife and kids can hide their vitals...

#2, I carry 4 types of ammo for different situations.... a lot of times my family or friends want to shoot my 300 pistol when I get there so I keep some plinking ammo, but I keep a mag of Lehigh defense 200grn max expansions 1 mag of surplus steel core 7.62x54r projectiles that I sized down to .308. 1 mag of tracer rounds (it makes people think twice when they see tracers going over their heads) and one mag of AP rounds.... because you never know....

I’m not a crazy prepper or anything I just want to be able to protect my kids and my wife under any situation I need to, to get back to the car and get out of dodge

[jim147]

All those molds came out long before there was a .300 blackout. The .30 cal is a great round in all things.

For the AR I'm not sure what the greatest is. While I have a .300 I'm sure there are better things depending on the job required.

[Wolfdog91]

All those molds came out long before there was a .300 blackout. The .30 cal is a great round in all things.

For the AR I'm not sure what the greatest is. While I have a .300 I'm sure there are better things depending on the job required.
Well yes but what I'm saying is you can just use them don't have to get anything specific. Already have a .30 cal what ever for your .308 or 30-06 bolt gun, well just sling the same Boolits for that in a black out case

[BNE]

I love my 300 BO. Great cast gun for sure.

Of course you should know better than to say something is the “ultimate” on this forum. We have a few opinions!

[cwtebay]

#1, in the trunk because we travel a lot and you would be surprised at some of the gas stations I have had to get gas in, last year it’s outside of Wilson NC I got blocked in by some gangsters that showed me his “piece” (Bryco 9mm) so I popped my trunk and showed him mine... I also keep my 72hr kit in my trunk with my bullet proof backpack... I figure if I need to the wife and kids can hide their vitals...

#2, I carry 4 types of ammo for different situations.... a lot of times my family or friends want to shoot my 300 pistol when I get there so I keep some plinking ammo, but I keep a mag of Lehigh defense 200grn max expansions 1 mag of surplus steel core 7.62x54r projectiles that I sized down to .308. 1 mag of tracer rounds (it makes people think twice when they see tracers going over their heads) and one mag of AP rounds.... because you never know....

I’m not a crazy prepper or anything I just want to be able to protect my kids and my wife under any situation I need to, to get back to the car and get out of dodgeI was meaning why in the trunk and not at your feet or other easily accessible area!! And I concur with the tracers!

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[reddog81]

I've got a 16" rifle I put together, 10.5" Bear creek upper, and a Ruger American Ranch. It's got my vote....

I've never had much trouble getting it to run right, but I've pretty much started with and stuck with Shooter World Black Out for powder in the AR's. I've had good luck getting anything from 190 grain to 230 grain bullets to run subsonic. I was expecting more problems based upon what I had read online.

Loading for the bolt action Ruger is about as easy as loading for .38 Special.

[Finster101]

Wolfdog91 I would think you should be able to get almost any .30 cal mold to work up say 175-185 grain and then only because of length and getting them to run in an AR. Nose profile plays a big part as the OAL gets longer. For my guns I size .310 yoou may be okay with .309 depending on your barrel. If you have a AR already uppers are (were) fairly inexpensive. If you buy a complete gun you have the option of using other cal. uppers with it. If I sound like a fanboy, I am. Not one of my friends who have shot mine with subs and the can didn't just start giggling after the first shot. You hear the action cycle, the brass hit the concrete and the boolit smack the target. All very distinctly.

[M-Tecs]

While tracers over the head may work that is going to be a hard one to justify in court.

https://gundigest.com/article/self-defense-warning-shots-good-idea

https://www.law.cornell.edu/cfr/text/10/1047.7

[Wolfdog91]

I love my 300 BO. Great cast gun for sure.

Of course you should know better than to say something is the “ultimate” on this forum. We have a few opinions!
Lol what can I say seems to be the best way to get people talking on these forums lol

[WinchesterM1]

While tracers over the head may work that is going to be a hard one to justify in court.

https://gundigest.com/article/self-defense-warning-shots-good-idea

https://www.law.cornell.edu/cfr/text/10/1047.7



IF I have to use them I honestly won’t care what the court says...

[WinchesterM1]

I was meaning why in the trunk and not at your feet or other easily accessible area!! And I concur with the tracers!

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I always carry a pistol beside me in the car... but I have had 2 bad experiences with getting gas. I always get gas and have my hand on the trunk pop button while I’m getting gas so I can get to my pistol in no more then 2 seconds

[cwtebay]

I always carry a pistol beside me in the car... but I have had 2 bad experiences with getting gas. I always get gas and have my hand on the trunk pop button while I’m getting gas so I can get to my pistol in no more then 2 secondsAtta boy

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[cwtebay]

IF I have to use them I honestly won’t care what the court says...Better to be judged by 12 than carried by 6.....

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[John McCorkle]

The great thing is brass can be formed from 223 brassExactly, I call it my garbage disposal. Got 556 brass with a boogered neck or shoulder? Make 300 blk brass out of it.

Pinch of powder and dab of lead. New primer and off to the races.

Lots of factors to consider in 'the ultimate' category but economy of brass (with right tools, made from free/cheap range brass) molds are plenty...mine eats almost every 30 Cal boolit I own. Capacity is same as 556, no special or proprietary parts, bolts or uppers- just a barrel swap.

Downrange energy for deer out to 150.

I think it's pretty awesome, some folks really balk at it....but especially today when ammo and firearms choice is in expensive or limited supply.... changing a barrel to change the game in medium game harvest is a no brainier.

300 blk makes some sense if you don't reload, but it makes all the sense if you do reload.

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[Lloyd Smale]

love the bo. Ive got 3 ars and a ruger american. With cast its a cheap shooter. Only thing cheaper is a 9mm ar. That said i only shoot super sonic and ive got a new ham'r that i think will replace the bos for deer hunting. I killed 6 deer with the bo using the 110 barnes and it did better then i expected but i still get nervous. The hamr has the same advantage with using 556 brass but has 200-300 fps more velocity which should step it up a class over the bo for actually killing and i still can shoot the same cheap cast bullets for plinking.

[popper]

no 300BLK is not the ultimate cast AR caliber Actually, it's about the same as 30/30 for cast, no, not same fps. 110gr to 185gr, subs and supers from same gun and just a bit more powder & lead. I can push a 145gr cast to 2200 fps, don't need much more. I run a 170 gr FN in my AR pistol, cycles fine, 850 to 1500 fps. If you want a slower twist, order a slow twist barrel. 30Hamr cases are hard to make from 223, pretty much chambered for lighter bullets. If I need speed, 30/30 or 308W.

[Texas by God]

Personally I think it is one of the neatest cartridges introduced in the past 50 years. Power between the .30 Carbine and 7.62x39, fits in the AR15 with just a barrel change. Mine is a 16" 1-7" twist carbine and I use full power 110gr to 150 gr jacketed bullets mostly, but it will eat most any .308" bullet.
But I've not been satisfied with my cast bullet experience with it over weights between 113grs and 180grs. Perhaps I'll try again someday, but as it is a home defense weapon is is loaded with 110 Speer spitzers at max velocity. If I had a 1-10" or 1-12" bolt action .300BO, it would be used with cast a LOT.

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[Lloyd Smale]

no 300BLK is not the ultimate cast AR caliber Actually, it's about the same as 30/30 for cast, no, not same fps. 110gr to 185gr, subs and supers from same gun and just a bit more powder & lead. I can push a 145gr cast to 2200 fps, don't need much more. I run a 170 gr FN in my AR pistol, cycles fine, 850 to 1500 fps. If you want a slower twist, order a slow twist barrel. 30Hamr cases are hard to make from 223, pretty much chambered for lighter bullets. If I need speed, 30/30 or 308W.

hammer cases are no harder to make then BOs. Run the full length case though a 300 hamr die with a bit of lube on the neck and trim it. It is harder if you trim it first then try sizing it. I guess the way i do it is a bit more work because i run it through a 250 savage die first to expand the neck to 25 cal then go to the hamr die and form it to 30 cal. But ive done it just running it though the hamr die and might loose one case in 30. No big deal. 556 brass is cheap or free.

[zarrinvz24]

Better to be judged by 12 than carried by 6.....

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Some of the Netflix documentaries make me wonder if this is truly the case anymore.

[popper]

250 savage die first May work. You get into the shoulder/neck area with 223 modded cases.

[cwtebay]

Some of the Netflix documentaries make me wonder if this is truly the case anymore.A lot of truth in that statement!!! But hey, seeing your dad in prison for defending the family trumps laying flowers on your kids' headstones.

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[John McCorkle]

no 300BLK is not the ultimate cast AR caliber Actually, it's about the same as 30/30 for cast, no, not same fps. 110gr to 185gr, subs and supers from same gun and just a bit more powder & lead. I can push a 145gr cast to 2200 fps, don't need much more. I run a 170 gr FN in my AR pistol, cycles fine, 850 to 1500 fps. If you want a slower twist, order a slow twist barrel. 30Hamr cases are hard to make from 223, pretty much chambered for lighter bullets. If I need speed, 30/30 or 308W.

There are no ars chambered in 30/30 or 308w though.

In AR platform (not AR10/SR25) there are alot of options from 25 sharps, 6.5 grend., 45 socom and 50 beowulf...but 300 blk is the easiest for cast, ease of conversion.

Like you I don't need the speed of 30/30, 308w or 3006 for my deer hunting (close in) 300 blk gives me the edge of smaller rifle, semi auto for follow ups on hogs, and more than enough penetration for all my deer hunting needs

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[Jsm180]

Exactly, I call it my garbage disposal. Got 556 brass with a boogered neck or shoulder? Make 300 blk brass out of it.

Pinch of powder and dab of lead. New primer and off to the races.

Lots of factors to consider in 'the ultimate' category but economy of brass (with right tools, made from free/cheap range brass) molds are plenty...mine eats almost every 30 Cal boolit I own. Capacity is same as 556, no special or proprietary parts, bolts or uppers- just a barrel swap.

Downrange energy for deer out to 150.

I think it's pretty awesome, some folks really balk at it....but especially today when ammo and firearms choice is in expensive or limited supply.... changing a barrel to change the game in medium game harvest is a no brainier.

300 blk makes some sense if you don't reload, but it makes all the sense if you do reload.

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Same here, I trashed a bunch of 223/556 by bumping the shoulder back too far. I had a spare lower, so I built a 300 AAC, perfectly logical in my book. :-)

[Burnt Fingers]

There are no ars chambered in 30/30 or 308w though.

In AR platform (not AR10/SR25) there are alot of options from 25 sharps, 6.5 grend., 45 socom and 50 beowulf...but 300 blk is the easiest for cast, ease of conversion.

Like you I don't need the speed of 30/30, 308w or 3006 for my deer hunting (close in) 300 blk gives me the edge of smaller rifle, semi auto for follow ups on hogs, and more than enough penetration for all my deer hunting needs

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Ya do know the AR platform started out with the AR-10????

[Photog]

300BO is Meh in my book.
Loaded slow, its a Pistol caliber cartridge (9mm, 38spl/357mag, or 40s&w power)
Loaded sub-sonic- its a 45 acp
loaded fast pistol - its a 357mag carbine
loaded faster its a 30M1 carbine
even faster its a 30/30
even more- its 7.62x39
Then its done. It doesn't do anything different than what has been done before - except that it can be fired in an AR15.
My only 300BO is an 16" AR, and its fun and all, but I have other 30 cals that do the same things. For the time spent developing loads, it just adds to the confusion of what its supposed to do. Its better to get a 9mm upper for plinking/light duty, and a 7.62x39 upper for a hard hitting short range rifle, and of course a 556 upper for general use.
I think it comes down to your commitment level too. Do you want to develop a subsonic, semi auto heavy boolit load for the same upper that also shoots a 30/30 power load? (My Win 94 does that too) (And my 308 mauser does that too), (oh yeah, my 30-06 03A3 does that too) But then bolt guns can't chew through ammo like an AR can, so you get to reload more with your 300BO AR15. The only Semi rifle that I want to reload for anymore is the M1 carbine. Oh and the M1 Garands, but again I'm not just spewing lead at the range from those.
Tell you what is more fun - 38 special lever actions. Cheap to cast for, cheap to find brass for, easy to load, the brass never wears out, the brass isn't flung into the next county, low powder charge, my ears don't hurt after a session in the field, and I can hit what I want out to 100 yds for 5 cents per round. With 5gr of W231 under 125gr cast boolit my 38 spl is zipping along at 1400 fps, shoots 1.5 inches at 50yds, and is a hoot. Getting that fun out of 300BO from an AR takes much more work in case prep and loading, and then the 125gr boolit is too short and likes to jam in some mags or not feed smoothly.
YMMV, I don't shoot the 300BO much anymore.

[John McCorkle]

Ya do know the AR platform started out with the AR-10????Don't think that's what op is talking about....and yes, fully aware ar 10 was first in line

Unless I am really missing the original question, op is asking about best caliber for cast in ar 15 platform

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[44Blam]

So, I have a cartridge that costs about 8 cents to load (assuming prices I bought components at and picking up range 223/556) for 300 bo and it is just super sonic. It cycles and shoots great. You need specific brass or turn the neck - either way. Sad part is you are limited by RPM to maybe 1500 or 1800 fps.
I think the 350 legend is a really great cast round as they tend to twist barrels in the 1:15 or 1:16 range. This means you can drive a boolit much faster. I've got a load that drives a 125 grain boolit (GC 9mm boolit) about 2500 fps. With great accuracy and no issues. The load I tend to go to is a 180 grain boolit at about 2000 fps and it is very accurate.

[Lloyd Smale]

300BO is Meh in my book.
Loaded slow, its a Pistol caliber cartridge (9mm, 38spl/357mag, or 40s&w power)
Loaded sub-sonic- its a 45 acp
loaded fast pistol - its a 357mag carbine
loaded faster its a 30M1 carbine
even faster its a 30/30
even more- its 7.62x39
Then its done. It doesn't do anything different than what has been done before - except that it can be fired in an AR15.
My only 300BO is an 16" AR, and its fun and all, but I have other 30 cals that do the same things. For the time spent developing loads, it just adds to the confusion of what its supposed to do. Its better to get a 9mm upper for plinking/light duty, and a 7.62x39 upper for a hard hitting short range rifle, and of course a 556 upper for general use.
I think it comes down to your commitment level too. Do you want to develop a subsonic, semi auto heavy boolit load for the same upper that also shoots a 30/30 power load? (My Win 94 does that too) (And my 308 mauser does that too), (oh yeah, my 30-06 03A3 does that too) But then bolt guns can't chew through ammo like an AR can, so you get to reload more with your 300BO AR15. The only Semi rifle that I want to reload for anymore is the M1 carbine. Oh and the M1 Garands, but again I'm not just spewing lead at the range from those.
Tell you what is more fun - 38 special lever actions. Cheap to cast for, cheap to find brass for, easy to load, the brass never wears out, the brass isn't flung into the next county, low powder charge, my ears don't hurt after a session in the field, and I can hit what I want out to 100 yds for 5 cents per round. With 5gr of W231 under 125gr cast boolit my 38 spl is zipping along at 1400 fps, shoots 1.5 inches at 50yds, and is a hoot. Getting that fun out of 300BO from an AR takes much more work in case prep and loading, and then the 125gr boolit is too short and likes to jam in some mags or not feed smoothly.
YMMV, I don't shoot the 300BO much anymore.

i do the same with my 9mm ar15s. The 16 inch gun shoots a 145 cast with 4 grains of surplus pr200 into 1 1/8 at a 100 yards. YUP a 100. My 4.5 ar pistol in 9 does 2 inch at 50. Good enough for the girls i run with. Brass is even cheaper then 38s these days and lasts a long time. 9mm ars have about replaced my 22lr shooting. Almost as cheap and the place i score mine at is WELL STOCKED:bigsmyl2: Add to that a guy can put together a 9mm ar a heck of alot cheaper then your going to buy a marlin 94 or winchester for. Another plus is they use ar parts which i have drawers full of about anything that could possibly break and if it came down to it i could strip parts off of one to keep another going.

[milsurpcollector1970]

I have had nothing but problems getting the 300blk to chamber in the ar with cast also had issues with the 30 hrt (a rimless 30 herrett made from 6.8 spc cases)

I finally gave up on 30 cal cast in the AR

I even got a throat Reamer to try fix the issue

[Burnt Fingers]

I have had nothing but problems getting the 300blk to chamber in the ar with cast also had issues with the 30 hrt (a rimless 30 herrett made from 6.8 spc cases)

I finally gave up on 30 cal cast in the AR

I even got a throat Reamer to try fix the issue

Maybe it was you? I've had no problems as long as the OAL is correct. You were using a 300 BLK barrel right?

[Lloyd Smale]

I have had nothing but problems getting the 300blk to chamber in the ar with cast also had issues with the 30 hrt (a rimless 30 herrett made from 6.8 spc cases)

I finally gave up on 30 cal cast in the AR

I even got a throat Reamer to try fix the issue

sizing to 308 solved most of my problems with the thick brass made from 556. Never had a problem with factory 300bo brass at 309. But the 308s shoot just as well so thats the way i do it today.

[roharmon]

You got the bolt to go forward with a 300 BO in a 223?


If I wanted a cast bullet AR, I would want the .358 based on the .223 case, not the .350 Legend.

The .300 BO has one issue....it can be chambered in a .223 gun and the result is unpleasant. One mistake is all it takes.

[M-Tecs]

You got the bolt to go forward with a 300 BO in a 223?

http://bulletin.accurateshooter.com/2019/08/scary-stuff-300-blackout-fired-in-a-223-rem-barrel/

[roharmon]

Obviously I am not h]going to try it, but still seems unusual to me

[jim147]

It makes long skinny boolits that way.

[iomskp]

I had a 300bk in a bolt gun, the heaviest mold I could get locally was a 220 gr, it shot really well. I have since sold the rifle and am concentrating on my 7.62 x 39.

[Burnt Fingers]

You got the bolt to go forward with a 300 BO in a 223?

It's happened to quite a few people. It starts with having light boolits loaded in the 300 Blackout and involves at least one idiot.