@hthomas interested in the velocities you get with CFE BLK and Belmont Action Rifle. Most other powders I have tried can only achieve lower velocities than factory loads.
x39 will be around for ages. If you can make a sub load for x39 of decent weight shoot, then I don't see any advantage in 300AAC (although the cases can be made out of .223). 300AAC cycled a semi auto AR15 with sub loads, that was where it was king IMHO.
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