311041 in 300 BO

[Blammer]

Well I finally got my 300 BO together. 16" brl and that's about the exciting part of it.

No tricked out upper, no super chomed slicked bolt, or any cheese grater hand guard, just plain stuff to make it run.

throat will take a .310 projectile and nose of .301 will be ideal as it'll just barely not touch it.

My 311041's sized and checked to .309 are working just dandy behind 14gr of Lilgun.

Feed, fire, eject, repeat.

Bonus is, groups seem to be good. Will have to officially test at distances longer than 25 yds, but currently, off hand I can stack them well.

Velocity seems to be on par for being able to take deer.

I'm liking it.

the 130gr jwords seem to shoot well too. :)

[petroid]

Sounds good! What alloy? Do you have any wetpack or water jug test results?

[popper]

311041 Feeds in an ar15?

[petroid]

Mine feeds the RCBS 165 SIL and Lee 170FN just fine. Got a button buck and a 10 pointer with the Lee bullet.

[Blammer]

yep, feeds in the AR15.

I'm saving milkjugs now, so hopefully soon there will be some type of testing. :)

just standard WW alloy.

believe it or not the 311291 WON'T feed, hangs up on the feed ramp every time. :(

[Hickok]

Blammer that is the way I like my AR-15 set up. I don't want my rifle looking like a Swiss army knife and weighing more than an M-60.:roll:

Hope to get into the 300 BO club some day!

[popper]

Just ordered 10 rnd lancer 40WT mags to see if my 31-165C will feed OK. Wilson removes the ridge for me. Don't think I can get the 170RD to feed right.

[petroid]

I use 20rd PMags with 5 rd limiters (10rds is legal here) and file the ribs down. They work flawlessly

[Blammer]

Here is a picture of the ammo.
311041, then 130gr Horn, then 120gr supersonic remington load
http://i54.photobucket.com/albums/g81/blammer8mm/Cast%20boolits/300BO/DSCN9669_zpsz7hla1qi.jpg (http://s54.photobucket.com/user/blammer8mm/media/Cast%20boolits/300BO/DSCN9669_zpsz7hla1qi.jpg.html)
http://i54.photobucket.com/albums/g81/blammer8mm/Cast%20boolits/300BO/DSCN9670_zps6froapgp.jpg (http://s54.photobucket.com/user/blammer8mm/media/Cast%20boolits/300BO/DSCN9670_zps6froapgp.jpg.html)

[petroid]

Is the gas check still in the neck or below?

[Blammer]

Hadn't thought about it.
It's probably below.

[petroid]

If it shoots ok I guess it doesn't matter. I just worry about them staying on if the case gets banged. Like when it chambers

[Elkins45]

From what I can tell there aren't many bullets of hunting weight that don't have their base below the neck on the blackout.

[Blammer]

Just for fun, I took 3 of my cast sized and lubed bullets and tried to pry off the GC.

Well 10 min later and a really beat to heck worthless hunk of lead later, I finally PRIED the GC off.

I don't think they are going anywhere.

[gpidaho]

Just got the BO upper together and on my Rock River lower yesterday. Haven't made it to the range yet but did make up five groups of three boolits to test function. Keep the info coming on what's working for you guys and I'll post when I get it figured out. Looking forward to a little more punch out of this round than the 223. Gp

[petroid]

Just for fun, I took 3 of my cast sized and lubed bullets and tried to pry off the GC.

Well 10 min later and a really beat to heck worthless hunk of lead later, I finally PRIED the GC off.

I don't think they are going anywhere.

Good enough for me! I haven't had any issues but it's been in the back of my mind. I had some issues with the Al checks but the copper ones seem to be firmly attached. The one I shot into water jugs is still on, too!

[petroid]

154714
Left to right: Lee 170FN fired into water jugs. Lee 170FN. Lee 170FN round. RCBS 165SIL round. Hornady 125SST round. The check sits below the neck but didn't come off as evidenced by the recovered slug. That 170FN load killed two deer this season. I shot the 165SIL into jugs too but didn't recover it. It went straight through four or five jugs with no evidence of expansion that I could tell. I didn't cast it and I think it was #2 alloy.

[Hickok]

Petroid, really good post and pictures. What is your alloy for the Lee boolit, ACWW or heat treated?

You guys are convincing me put a .300 BO barrel on my "Gotta have" list as soon as I can get back to work and get some cash flow.

[petroid]

Petroid, really good post and pictures. What is your alloy for the Lee boolit, ACWW or heat treated?

You guys are convincing me put a .300 BO barrel on my "Gotta have" list as soon as I can get back to work and get some cash flow.

Its range scrap which weighs nearly the same as 50/50 COWW/Pb, so I assume its a similar composition. Air cooled. Don't know BHN but relatively soft.

[popper]

I use the 10 rnd Pmags with the ridge filed down. I can only load 2 rnds if the ridge isn't removed. They jam with more loaded. Had trouble with the metal mag front tab grooving the nose when chambered. Going to try the Lancers with the metal lips, my pmag must be getting worn as I had feed problems last time out with cast. The Rem 120 is pretty accurate, have some of the hornady but haven't shot them yet. 168, 155 Amax works good but BT doesn't leave much room for powder. Got some hornady 150 FBSP to try. Saw Anderson is working to get Rainer to make 170 FBSP plated.

[petroid]

Blammer, I'm at my wit's end waiting on either water jug or hunting results! I hope you've got some venison with that BO load and have just been too busy to post your results, lol.

[Smoke4320]

If you use a 50/50 mix about 1500-1600 FPS and keep shots to under 125 yds with correct placement you will have dead deer with the blackout ..

too many people doing it already .. me included

[Blammer]

I worked 65 hrs last week, this week is promising to be no slower.....

soon....

[Blammer]

FYI, I picked up a 300 BO magazine from Wideners, just to try it out.

It works great! Feeds well for me! Seems they tweeked it just a little, made the side ribs that rub against the bullets not as deep and did something to the sides of front edge, where the bullets contact, when being pushed out of the mag... They work well. :)

Wish they made them in 20 rnd versions. :)

[petroid]

Well, I'm glad you don't have to worry about finding work, but sorry you don't have any free time. I hope it all works out for you.

[popper]

The 40wt by lancer worked great, 3 different bullets and no feed problems. No dented noses on fn cast.

[GabbyM]

FYI, I picked up a 300 BO magazine from Wideners, just to try it out.

It works great! Feeds well for me! Seems they tweeked it just a little, made the side ribs that rub against the bullets not as deep and did something to the sides of front edge, where the bullets contact, when being pushed out of the mag... They work well. :)

Wish they made them in 20 rnd versions. :)


Are you referring to the D&H mags? Marked for 300 Blackout.

BTW Wideners has the 20 round 5.56mm D&H mags on sale. Waited for years for 20's to go on sale then bought six just a couple months ago. Now they are on sale. D&H is the best you can buy . I've had them all from back when the AR was a new thing.

Just measured the front rib depth on this new D&H 20 round mag. It is .125" deep on the outside. Using the depth slide on a calipers. Back side of the rib is about 1.565" from rear of magazine body, not the guide rib. Rib detent is about 5/16th inch wide on the face. OK just wondering about dimensions since some mall ninjas say the D&H 300 BO is just a relabeled standard mag.

[GabbyM]

The 40wt by lancer worked great, 3 different bullets and no feed problems. No dented noses on fn cast.

Good to hear. 30 round magazines on a hunting rifle are about as useful as nipples on a bore hog.

[Jupiter7]

Good to hear. 30 round magazines on a hunting rifle are about as useful as nipples on a bore hog.
You should watch some hog population management videos. Also, that sounds like anti-gun banner talk :)

[Blammer]

I actually measured the 300 BO mag and compared it to some of the others I bought at the same time. The 300 BO mag is indeed a little bit different. Yep the main ribs are not as deep, and you have about .05 more room due to the shallower bullet ribs. May not seem like much but it's visible and just enough. :)

the only think I don't like about the 30 rnd mags, is they are too long. :)

I shoot off the bench a lot and they make you set up the sandbags a bit higher than is comfortable for me. Plus 30 rnds is a bit heavy to drag around all day hunting, and I seem to catch it on everything.

For blasting fun, I love the 30 rnd mags. More trigger time. :)

[GabbyM]

https://www.wideners.com/itemdetail.cfm?item_id=100001100

That's good news Blamer. Believe I'll order one to send along with the boolits.
SIL handed me a 30 round mag full of 208 grain Hornady A max. You definitely will not mix that up with a stick of 223's.