Looks like I need some more/different powder. And dies.
In for results. I would probably use something in the 125 grain for a projectile, and would try a few with 296/110 if I had any. That powder is always very accurate for me.
I had horrible results with h110 and 125 Sierra match kings. I switched to accurate 1680 and it improved, but I still get better results from cheap plinking ammo. 300blk has been an exercised frustration for me.
I think Brownells had a deal going where the HAZMAT fee was waived....don't quote me though.I'm going to call around and see if I can find some Lil Gun locally. Hate the haz mat fee for just a little powder. There are a few reloaders here at work and we usually make a group powder order. Its great to have 28 lbs of powder and 7000 primers on the front porch.
@handloader would love to play with some old brass. Ill kick in some cash and pay shipping gladly.
I have started using Accurate/ Western powders, Magpro specifically for my more serious shooting such as at live critters. I set the bullets close to maximum cartridge oal and work up to max charges. The pressures stay reasonable longer that way for me. My chronograph results have mirrored and often exceeded the Western print data. It has been my experience that Hodgdon/IMR data for newer cartridges has been overly optimistic. The old standbys such as service rifle 30-06 7.62x51 and rimmed American rounds has been pretty much on with IMR, but those have been established for decades. You are probably onto something with the Accurate powder in 300 blackout. Hornady match bullets have been better for me than Sierra's due to similar performance at lower cost. @War Paint , I think that I have some factory 300blk brass if you want to try those if you are trimming .556 to see if it makes a difference. I can check the barn tomorrow.
OK OLD MAN Just for the record I'm 62. If I get time this weekend I will see what Quick Load says as for FPS with lil Gun and check OBT for a node. My barrel is 16 inches. What length is every one shooting ?Taking money to ship a gift to a friend....not this old man. I only found 54 300 blk headstamped, but I will get them in the mail tomorrow or Friday. Just p.m. me your address.
I'm going to call around and see if I can find some Lil Gun locally. Hate the haz mat fee for just a little powder. There are a few reloaders here at work and we usually make a group powder order. Its great to have 28 lbs of powder and 7000 primers on the front porch.