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I've had good success with 3031 out of an AR-10. 39.5 grain with Sierra 168g matchkings. I think (from memory) that 42 gains is a compressed load. Minute of paper plate at 300yds.
Being a long stick powder, it doesn't meter all that great. I measured individual loads using a Chargemaster with the straw mod and was getting repeatable charges within one grain stick. With that amount of effort, not exactly "plinking" ammo.
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