300 blackout cast bullet accuracy

[27judge]

im thinging on getting a 300 blackout upper. what are some of the accuracy results fellow members are getting with cast bullet loads. i plan on using this upper for 25 to 50 yrd informal fun/plinking many tks for your time ken

[scb]

http://i487.photobucket.com/albums/rr236/scb2008/005.jpg

This is a 100 yd group using the 311247 boolit. About 2.5" or so. Going to start working with it again this spring. I've have much better luck with 311365's and 311329's. About 1.5" or a little better.

[winchester85]

cast bullets in a gas operated auto? i was always told that cast bullets will plug up the gas tube eventually. as i type this i think it is probably not a problem, but? i have a wildey auto pistol too, never run cast in it because of the gas port issue.

[DrB]

Looks like some keyholing on that target, maybe? What twist/velocity?

I haven't started load workup yet as my upper is still on backorder.

I've got the same 247gr mold, and have made up a bunch of brass.

[Tonto]

I've run a few hundred of the NOE Whisper cast design thru a DSArms upper in 300 AAC/Blackout, all air cooled wheel weight, with and without gas checks, subsonic and slightly over, very accurate so far and no leading or gas port problems... This appears to be a great cast bullet round but be prepared to cast a lot of bullets, it is big fun to shoot. Preliminary accuracy seems to hold great potential too. I enjoy the casting, making brass and even the shooting. I'm happy to be in the Blackout game. I use 1680 powder and am working on a PD 820 load.

[RugerFan]

I've run a few hundred of the NOE Whisper cast design thru a DSArms upper in 300 AAC/Blackout, all air cooled wheel weight, with and without gas checks, subsonic and slightly over, very accurate so far and no leading or gas port problems... This appears to be a great cast bullet round but be prepared to cast a lot of bullets, it is big fun to shoot. Preliminary accuracy seems to hold great potential too. I enjoy the casting, making brass and even the shooting. I'm happy to be in the Blackout game. I use 1680 powder and am working on a PD 820 load.

Assuming you have a carbine length gas system, does your action work fully with sub-sonic loadings? I'm trying to decide whether to get a pistol or carbine length gas system barrel for my .300 BLK build.

[scb]

cast bullets in a gas operated auto? i was always told that cast bullets will plug up the gas tube eventually. as i type this i think it is probably not a problem, but? i have a wildey auto pistol too, never run cast in it because of the gas port issue.

http://castboolits.gunloads.com/showpost.php?p=1406367&postcount=16

[thehouseproduct]

Assuming you have a carbine length gas system, does your action work fully with sub-sonic loadings? I'm trying to decide whether to get a pistol or carbine length gas system barrel for my .300 BLK build.
Pistol. Pistol. Pistol. All the 300BLK guy saying carbine works subsonic aren't accounting for the reduced friction of cast lead. You'll have way more versatility with a pistol port and adjustable gas block.

[Gunnut 45/454]

My main target/plinking load for my 300 Blk is the Lee 150gr GC over 16.5gr IMR4227 at about 1950ish FPS Getting about 2-2.5" groups at 100 yards

[RugerFan]

Pistol. Pistol. Pistol. All the 300BLK guy saying carbine works subsonic aren't accounting for the reduced friction of cast lead. You'll have way more versatility with a pistol port and adjustable gas block.

Basically confirms what I've been hearing. I just ordered a pistol length gas tube and adjustable low profile gas block from Midway. Now for the barrel. Those with pistol length gas ports are few and far between.

[RU shooter]

Now for the barrel. Those with pistol length gas ports are few and far between.You can contact Ron Williams he's over at at AR 15.com He can make you a barrel just the way you want it and at a decent price too. He's making me a super only 20 inch with 12 twist now. Pm me if you want his info.

Tim

[mstarling]

Paladin Machine Services is one of the folks with the most experience in 300/221 and 300 BLK barrels and 3 position gas blocks.

He uses Douglas stock. His work is very, very precise.

Made my 300 BLK bbl and gas block and has threaded a number of AR bbls as well pistol and other rifles barrels for me. Decent prices for VERY high quality work. I think he may be the most careful firearms machinist I've ever had the pleasure to meet.

His e-mail is tp555 at windstream.net

[RugerFan]

Coincidentally, Midway just got in some CMMG barrels w/pistol length gas ports so I ordered one. Now just to decide on which free-float hand guard and I'm there.

[Tonto]

My DSArms upper has the carbine system and functions subsonic with 1680 powder. It's the 820 loads that is stove piping as I work it up. No problems yet but I'd like to find the load that lets me make good use of the 8lbs of 820 on hand. Seems a little slower than the label says it should be. But isn't that half the fun? Regardless, no gunk or leading at the lower velocities so the original worry about gas tube clogging seems not an issue.

[HodakaGA]

Tonto,

PD 820? Is that WC820? I see references of WC820 lots ranging from H110 to AA#9 speed. I guess you can't get it to cycle without going supersonic?

[thehouseproduct]

My DSArms upper has the carbine system and functions subsonic with 1680 powder. It's the 820 loads that is stove piping as I work it up. No problems yet but I'd like to find the load that lets me make good use of the 8lbs of 820 on hand. Seems a little slower than the label says it should be. But isn't that half the fun? Regardless, no gunk or leading at the lower velocities so the original worry about gas tube clogging seems not an issue.
What bullets? What barrel length? How big is the gas port? Stock buffer springs and weight?

[Tonto]

Yes WC820PD bought several years back at Pats Reloading. 16 inch barrel in a stock DSArms upper. I have no idea what the gas port size would be. Bullets are air cooled NOE-247-Whisper cast from wheel weight alloy, both with and without checks. It won't be the end of the world if the load doesn't stay subsonic. I'll still have the makins' for lots of ammo. Powder label says reduce H110 loads by 10%. I'm now up to the H110 loads (minimum) and they don't yet function. Next loads will be supersonic on the low end.

[Moonie]

Pistol. Pistol. Pistol. All the 300BLK guy saying carbine works subsonic aren't accounting for the reduced friction of cast lead. You'll have way more versatility with a pistol port and adjustable gas block.

Ok, I'm here to tell you I'm running not one but 2 uppers (mine and one of my sons) with H4895 245gr boolits from an Accurate mold, boolits running right at 1050 and function perfectly in BOTH uppers. Both uppers are carbine gas with stock carbine buffer and spring. Sons gun was built as a 5.56 mine as 6.8, no changes to the lower at all to cycle sub 245gr boolits.

[DrB]

What kind of accuracy with the 247s? Results, please? anyone have signs of keyholing as evident in the target above?

[thehouseproduct]

Ok, I'm here to tell you I'm running not one but 2 uppers (mine and one of my sons) with H4895 245gr boolits from an Accurate mold, boolits running right at 1050 and function perfectly in BOTH uppers. Both uppers are carbine gas with stock carbine buffer and spring. Sons gun was built as a 5.56 mine as 6.8, no changes to the lower at all to cycle sub 245gr boolits.
16" barrels I assume? Mine at 13.5" makes things much harder with the reduced dwell time. Again a pistol will do anything a carbine will do with an adjustable block.

[Moonie]

16" barrels I assume? Mine at 13.5" makes things much harder with the reduced dwell time. Again a pistol will do anything a carbine will do with an adjustable block.

Except work with sub AND supersonic loads without fiddling with the gas block...

[thehouseproduct]

http://img.tapatalk.com/446d429c-a678-488d.jpgI don't know about accurate but I loaded a lot.

[Fistybum]

I've run a few hundred of the NOE Whisper cast design thru a DSArms upper in 300 AAC/Blackout, all air cooled wheel weight, with and without gas checks, subsonic and slightly over, very accurate so far and no leading or gas port problems... This appears to be a great cast bullet round but be prepared to cast a lot of bullets, it is big fun to shoot. Preliminary accuracy seems to hold great potential too. I enjoy the casting, making brass and even the shooting. I'm happy to be in the Blackout game. I use 1680 powder and am working on a PD 820 load.


Where is sub/super happening with 1680????? What barrel lenght??

[BBarrett]

I have gotten 2.0 in. groups at 200 yds. with my 10 in. contendwer barrel in 300 Blackout using 14.5 gr. H110, CCI 450 primers, 150 gr. GC bullets from RCBS mold.

[DrewTenney]

So here is a question, my cast loads will not feed well in my 300AAC, what OAL are you guys using? also, I haven't been able to find good load data for the LilGun powder that I bought. This catridge is not in my lyman manual.

[popper]

Moonie - use 4895 for 160ish at all? Did find some Rx7 & 4227 today.

[Moonie]

Moonie - use 4895 for 160ish at all? Did find some Rx7 & 4227 today.

I haven't for two reasons, H110/W296 works perfectly for that weight range (not subsonic) and even with the heavy weights the ES was around 100fps, just too much for good accuracy.

I find that 15.3gr of H110/W296 with a 155gr is absolutely perfect for my use in both of our uppers and is quite accurate.

[Jbiker]

what COAL are you running on the 150 gr gas check's? there seem's to be a lot of powder data and velocity data but no COAL lengths to go with it !!!

[popper]

Pretty much mag allowable length, depending on boolit profile.

[Moonie]

Has anyone used 680 in the .300 blackout yet?

Considering that 680 has been discontinued since the early 90's what exactly would be the point? It should work similarly to AA1680.

[HodakaGA]

Has anyone used 680 in the .300 blackout yet?

Yes, but my lot of 680 was at least 1/2 grain faster than my lot of 1680. Reduce and work up.