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Best Powders for 12" 300-221
I've been gathering all the loading info I can for my SBR project. What are powders that would work best? Barrel will be 12" with pistol gas port. I want to do both 125gr supersonic and 190 to 220gr subsonic and will be using a 762 YHM Phantom. I didn't want to hijack another thread I read.
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