This is all interesting stuff. Im doing a build in 6.5 PRC and have picked up some IMR 8277 as so many powders are hard to get right now. It should be pretty close to H1000. I didnt think of superformance though. I will try 143 ELDX to start but am not expecting 2990 out of my 22” bbl though! Thats very fast. Barrel life may not be great.
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