luzyfuerza
Member
Some time ago, I bought 3k pulled 147 grain FMJ bullets to use in my Garands. They were CHEAP!
I've tried to use these bullets in my 300 blackout SBR (10.5" bbl, pistol gas system, free float handguard) using charges of IMR4227, W296, AA1680, and some surplus WC820. Accuracy has been terrible with every load that I've tried (10+" "patterns" at 100 yards).
It isn't the gun. I shot factory Remington 120 grain OTFBs into a five-shot 1 1/8" group at 100 yards. Factory Barnes 110 grain TAC-TX went into 2 3/8". Factory Hornaday 208 grain AMAX were 2 1/2". Factory SigSauer 220 grain were 2 1/4". Not tack-driver accuracy and I'm sure that I can do better, but all of these groups are a lot better than 10+".
It's not my loading technique, either. Initial loads (no accuracy workup) I put together with WC820 using Sierra, Speer, and Nosler boat-tail 150 grain projectiles produced 1 1/8" to 1 1/4" five shot groups at 50 yards.
I have lots of these 147 grain projectiles left. What do you suggest I do to squeeze every bit of accuracy out these projectiles in the blackout?
I've tried to use these bullets in my 300 blackout SBR (10.5" bbl, pistol gas system, free float handguard) using charges of IMR4227, W296, AA1680, and some surplus WC820. Accuracy has been terrible with every load that I've tried (10+" "patterns" at 100 yards).
It isn't the gun. I shot factory Remington 120 grain OTFBs into a five-shot 1 1/8" group at 100 yards. Factory Barnes 110 grain TAC-TX went into 2 3/8". Factory Hornaday 208 grain AMAX were 2 1/2". Factory SigSauer 220 grain were 2 1/4". Not tack-driver accuracy and I'm sure that I can do better, but all of these groups are a lot better than 10+".
It's not my loading technique, either. Initial loads (no accuracy workup) I put together with WC820 using Sierra, Speer, and Nosler boat-tail 150 grain projectiles produced 1 1/8" to 1 1/4" five shot groups at 50 yards.
I have lots of these 147 grain projectiles left. What do you suggest I do to squeeze every bit of accuracy out these projectiles in the blackout?
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