300 Black out and LEE 312-155-2R any luck?

[A pause for the COZ]

Not looking for Subsonic stuff. Looking for a plinking load that will cycle the action.
16 inch carbine upper 1 in 8 twist.

Powders available.Bullseye, Unique, Herco, 2400, H110, RL7, H4895, RL15,3031, H335, BLC-2, Varget.

Should be able to find something in that group.
Any ideas?

[longranger]

www.hodgdon/reloading.com

[cutter_spc]

I use 15gr. of 296 under that bullet, seated to the crimp groove. I have seen loads posted up to 16 and 17gr. but 15 cycles my action just fine and no leading.

[A pause for the COZ]

www.hodgdon/reloading.com

Went there looked at it. Did not see any data for the LEE 312-155-2R or any cast bullets loads for that matter.

[A pause for the COZ]

I use 15gr. of 296 under that bullet, seated to the crimp groove. I have seen loads posted up to 16 and 17gr. but 15 cycles my action just fine and no leading.

Is 296 comparable to H110? I was concerned about reduced loads in that powder. heard it does not like that. I use 17gr H110 in my Jacketed loads for the 300. Does real well.

I had tried some RL7 in my 30-30 with good results. SO I may try that.

[RU shooter]

Give a try with the RE7 16-18 grs, Not on your list but Lil Gun at 15-16 grs worked well with cast in that weight range. You can also try a case full of 4895 it worked just fine in my gun but I had a 20" barrel

[missionary5155]

Greetings
Tried that boolit in my 300Blk barrel and it would not chamber reliably.
So far my barrel only likes SP designs which there are many of.
Mike in ILL

[A pause for the COZ]

Give a try with the RE7 16-18 grs, Not on your list but Lil Gun at 15-16 grs worked well with cast in that weight range. You can also try a case full of 4895 it worked just fine in my gun but I had a 20" barrel

Thanks. 16 to 18 gr RL7 is kinda where I was thinking. I just did not want to be the 1st one to try it.

[Jailer]

15.3 gr of H110 COAL of 2.055 is what works for me. Runs around 1850 FPS and is accurate. 16gr on up and accuracy falls of quite a bit. 16.5gr starts showing pressure signs and at 17gr I started popping primers.

[RU shooter]

Thanks. 16 to 18 gr RL7 is kinda where I was thinking. I just did not want to be the 1st one to try it.No your not the lab rat.... I used 17 gr with a 200 gr 311299 and it also did well so with the little 155 you cant overload it with that powder as you can only get 18 gr max in a RP case

[Gunnut 45/454]

You have H110 just load up 15.5gr an give it a go. Should cycle your gun just fine. Go up at .2 gr at a time until it does. I use Lil'Gun myself 16.6 gr run them at 1920 fps.:mrgreen:

[Moonie]

I've shot that boolit with 16gr W296/H110 (same powder) and it seems to shoot well. Feeds flawlessly.

[sfcairborne]

I ran 5744 today in mine, 9' sbr pistol length gas. usedn the starting weight for 160 jackets as mine are casting out at 160. functioned fine, no pressure , light crimp at the middle of the first driving band.

[Artful]

Works ok in both 7.62x39 and 300 Whisper for me.

[popper]

Is 4895 a little slow for BO?

[Gunnut 45/454]

popper
Yes IMR 4895 is to slow. IMR4227, H110/W296, LilGun are the powders to use.

[RoyEllis]

300 MP works darn good in a blackout too...

[petroid]

I just loaded some with 15&16 gr of Re7. Test shot at 17gr started to show flattened primer. Not cratered but want to see how these do first. Tight to chamber with a .310 boolit

[popper]

A case full of 4895 was what I was questioning.

[petroid]

I got 1450 with 15gr reloader7. 1567 with 16.3gr. Got some h110 loads ready for tomorrow

[petroid]

Quote: A case full of 4895 was what I was questioning.

I don't know what kind of velocities you'd get, but I think it wouldn't have enough pressure to burn completely. A full case of Reloader 7 doesn't seem to be over pressure but just at the top end. Maybe if you had a heavy bullet seated way long to get as much powder in as you could...

[fcvan]

I bought the Lee C312-155 2R specifically for the 300 AAC BO. I use a Lee .311 push through sizing die. All of my loads have been with IMR 4227 which has been fired through 2 different 16" AR platform rifles. The first one was a neighbors rifle which we test loaded at 14, 14.5, 15, and 15.5 grains. Velocities were 1800, 1900, 2000, and 2100 fps, with ES close to 30 fps. These loads were ESPC with HF Flat BLack, and aluminum gas checks from a PatMarlins Checkmaker die. These loads were fired at the Fort Carson range which is over 6000 feet of elevation.

The velocities were not consistent with the reports of others. all cases were marked with a sharpy so I could inspect for obvious pressure signs with magnification. I did not see any differentiation between the cases fired at different charge loads. I had run out of ESPC boolits so I lubed up some with 50/50 Lee Liquid Alox/Mineral Spirits, using 2 light coats. I loaded 10 of those using the 15.5 grain load and too my surprise, they went 2300 fps with an ES of about 27. Pressure signs looked no diferent than the 14 grain ESPC loads.

So, I finally got my 300 assembled from a polymer lower and a kit from Model 1 sales. I loaded up some ESPC at 14 grains and headed to a shooting spot near my CA home which is at sea level. The range might actually be about 100 feet ASL, not sure. anyway, the rounds clocked about 1700 FPS with an ES of 30 fps. I didn't ladder up as I didn't have much time and merely wanted to break the new off the rifle. My next range date will include bringing my portable reloading setup so I can build the rounds, launch them, and do some better record keeping.

I like this boolit, I love ESPC for this cartridge but was rather surprised by the performance of the 50/50 Alox loads. The most impressive thing was this. Somone had brought a 12" table saw blade and had poked pretty little 30 cal. holes through the blade. I shot the blade with the C312-155 2R at 1700 fps and it tore away jagged holes almost an inch in diameter. Impressive. I also shot some tin cans which were shredded by the lead boolits. I'm not a big fan of shooting aluminum cans because they are readily recyclable as plain base gas checks. Tin cans are evil. The lid falls in when you open them. They try to cut you when you are opening and/or fishing out the lid.

I hate tin cans so I shoot them. With FMJ you just get pretty holes and the can barely budges. When shot with a cast boolit they suffer greatly from being torn and shredded on impact. Call me eccentric but I think cans try to cut me. I hate rude behavior in a can, I won't tolerate it. So I shoot them. My doctor says I need therapy. He prescribed 8 more pounds of IMR 4227, 300 pounds of alloy, several bricks of small rifle primers, boolits cast from the Lee 312-155 2R, taken as necessary.

[Moonie]

I've used H4895 in 300BO and found the ES exceptionally high, I moved to other powders, W296/H110 and RL-7 have worked well for me.

[Artful]

Powder wise - 5744 and 680 or AA1680 seems to work well with carbine gas tube

[fastfire]

Powder wise - 5744 and 680 or AA1680 seems to work well with carbine gas tube


Can give me a starting load for 5744 and the Lee 312-155 2R. I have yet to get Cast load to consistently shoot less than 1.5". This barrel will do MOA with Jwords.

[sfcairborne]

I used the starting load for the 160/165 jacketed, listed in the new Hornady manual. But mine cast,lubed and gas checked weight in at 163. Shot out of KAK 9 1/2 pistol length barrel. Zero problems. Using 5744

[sfcairborne]

I'm going to work this powder charge down when I get a chance, working down a grain at a time

[RoyEllis]

Can give me a starting load for 5744 and the Lee 312-155 2R. I have yet to get Cast load to consistently shoot less than 1.5". This barrel will do MOA with Jwords.

Only mediocre accuracy with cast is exactly why I ordered a 12" twist custom HBAR profile AR barrel from McGowen for my blackout....I think the 8" twist is way too fast to shoot well with cast, and IDGAS about shooting subsonic/suppressed with it. When new tube gets here & I can wring it out, I'll post a thread with results (targets, chrono'ed speeds and load details).

[petroid]

Im struggling with this boolit right now. OAL of 2.050 makes chambering difficult and not reliable. I am PC'ing them which fattens them up a little too much I guess. I tried some at 2.030 and they seemed to work so I'll have to try some more.

[fastfire]

[QUOTE=RoyEllis;2845411]Only mediocre accuracy with cast is exactly why I ordered a 12" twist custom HBAR profile AR barrel from McGowen for my blackout....I think the 8" twist is way too fast to shoot well with cast, and IDGAS about shooting subsonic/suppressed with it. When new tube gets here & I can wring it out, I'll post a thread with results (targets, chrono'ed speeds and load details).[/QUOTE

CARBINE OR PISTOL LENGHT GAS TUBE?

[RoyEllis]

18" w/carbine length gas is what I ordered, you can pick what you want & they'll cut it your way.

[Artful]

Can give me a starting load for 5744 and the Lee 312-155 2R. I have yet to get Cast load to consistently shoot less than 1.5". This barrel will do MOA with Jwords.

http://sierrabullets.files.wordpress.com/2013/07/300-aac-blackout.pdf

[fastfire]

http://sierrabullets.files.wordpress.com/2013/07/300-aac-blackout.pdf


TANK YA:bigsmyl2:

[Artful]

I just pulled some of the boxes of 300 Whisper/Blackout I have and they are all 220 SMK over 10.5 grains 5744
the only box of cast 155 are unlabeled so I'm not sure what I have in them (best shoot 'em up and start over)
If I'm remembering right (so don't trust this) I started at 15 grains of 5744 and worked up until locked the bolt on empty at 16.???


another good place for load data

http://www.ramshot.com/wp-content/uploads/2010/09/WP_LoadSpec_7-2-13.pdf
see page 37

[sfcairborne]

I ran 13grns a5744 functioned great out of my 91/2 barreled 300 last shot bolt hold open and feed and extracted without a hick up

[popper]

My 1:7 16" does 1720 with 15gr 4227 under a 150 PB. 600' alt. Got a 18" 1:10 mcgowen on order. Fellow shooter at the range is getting 1400 using the Lee 200 with LLA & 1680.

[leowa]

Is any one running the Lee 312-155 2R to the crimp grove on the boolit. How much RL7 to not run into over pressure problems.

[Moonie]

Is any one running the Lee 312-155 2R to the crimp grove on the boolit. How much RL7 to not run into over pressure problems.

Around 18.5gr should get you in the 1,800fps range and should be well within pressure limits.

[yovinny]

Is any one running the Lee 312-155 2R to the crimp grove on the boolit. How much RL7 to not run into over pressure problems.

Is seating to the crimp groove putting the check completely below the neck with that boolit ?

I'm using it's 'sister' TL bullet myself, seated out to put the check even with the neck/shoulder junction. It engages the rifling, but that hasent caused me any issues, either chambering or ejecting live rds. But mine are also checked at .311 and alox dipped, rather than powder coated.

Mine is 1:8 16" bbl with pistol gas and over 17.5gr wc680 I've recieved the best accuracy i've ever gotten with cast in a rifle. At 50yds it prints 5rds into ragged nickle size holes. Havent crony'd or stretched it out further yet,,,,But I'm sofar VERY happy ;)

Cheers, YV

Edited; BTW, going to a 32-20 lyman 'M' die, instead of just using a 308 case expander, completely improved loading and accuracy with these for me.

[skeet1]

As others have said and I concur 15.3 gr. H110 or 296 works well.

Ken

[Jeff Maney]

I've shot that boolit with 16gr W296/H110 (same powder) and it seems to shoot well. Feeds flawlessly.
Lee 312-155, same load & results here! Works great in my DPMS 16" carbine
Jeff

[filthygovmploye]

As others have said and I concur 15.3 gr. H110 or 296 works well.

Ken

is that including gas check or...?

yes i know htis is 5 years old, sorry

[Conditor22]

h110/296 8.7grn 1/2 group 1045fps L 312-155-2R .309 sized 150 feet NO GC

[filthygovmploye]

h110/296 8.7grn 1/2 group 1045fps L 312-155-2R .309 sized 150 feet NO GC

super thanks! i plan ton use these in a ks47 and a saiga 300 blk