Mini 300blkout/Garand build

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Baltimoreed11754
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Re: Mini 300blkout/Garand build

Post by Baltimoreed11754 » Thu Aug 20, 2020 6:50 pm

Had a setback. It was running before I installed the ruger reinforcement and moved the bbl action back 1/4 inch. I had to install the steel because it was battering the oak inserts that I was using. Had to set the sction back to get the gas cylinder, handguard and stock to work right. But I’ve moved, twisted or created friction somewhere that wasn’t there before. Initially [after my latest mods] it wouldn’t cycle at all but now after a lot of playing with it I’ve got it to eject 100% and feed about 50%.
‘Give’em hell, Pike’

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Baltimoreed11754
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Re: Mini 300blkout/Garand build

Post by Baltimoreed11754 » Wed Sep 02, 2020 8:51 am

After a lot of work looking for anything that was rubbing, in a bind or not right I’ve gotten it to feed and eject 150 gr jacketed bullets. The case is just about full of CFEBLK and is certainly being compressed but I’m not getting high pressure signs. I would like it to also shoot 125/130gr bullets too so I’m looking at other powders. Been working on a couple of other builds [a 1903 Springfield Scout and an 1873/76 Centennial carbine] so I haven’t done anything with this build lately.
‘Give’em hell, Pike’

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dellet
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Re: Mini 300blkout/Garand build

Post by dellet » Wed Sep 02, 2020 9:28 am

If you’re having cycling issues do to low pressure or gas volume, CFE is hard to beat. It’s velocity challenged, but accurate when you get a full case. I would wonder about carbon and unburned powder possibly being an issue for cycling many rounds.

296/H110 are hard to beat for bullets in the <130 range, as long as it cycles.

You might try Accurate LT-30. It has gas qualities similar to CFE, but burns cleaner. You lose about 100 fps compared the 296, but again it can be extremely accurate.

I think sticking with known reliable sub powders may be your best bet to keep it running reliable. 1680, N120, Reloader 7. And just live with the velocity loss and make up for it with accuracy.
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plant.one
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Re: Mini 300blkout/Garand build

Post by plant.one » Wed Sep 02, 2020 11:31 am

dont forget shooters world socom and shooters world blackout (do-63.1 and do-63.2 respectively)

those are also both proven sub powders that produce a lot of gas, and are cleaner burning than 1680, especially with subs.
Reloading info shared is based on experiences w/ my guns. Be safe and work up your loads from published data. Web data may not be accurate/safe.
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Baltimoreed11754
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Re: Mini 300blkout/Garand build

Post by Baltimoreed11754 » Wed Sep 30, 2020 11:45 am

The CFEBLK seems to work with the 150s but I've had to experiment some to get reliable function with 125-130 gr. I tried some LilGun powder that I had and it’s working. Everything that I’m shooting with these powders eject fine but have issues with picking up the next rd. Remember, my gas port is 23 inches from the boltface. I probably wouldn’t be having these issues with a 20 inch bbl which would be my last resort. More reloading work is needed.
‘Give’em hell, Pike’

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