I loaded some IMR 4350 in 10 pieces of FC small primer brass with the 150 gr Sierras. Pappabear's LMT gas gun shot those really well. 4 holes pretty much touching, and 1 left flier that stretched the group to MOA.
I also loaded regular Hornady Brass with the 150s and IMR4350. One bergarra bolt gun shot them almost 3 MOA, the shot the 140 ELDs about a 1/2 MOA with the Lapua brass. It's amazing how finnicky barrels can be.
"What would a $2,000 Geissele Super Duty do that a $500 PSA door buster on Black Friday couldn't do?" - Stopsign32v
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