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It would be interesting to see a subsonic accuracy comparison between two barrels of the same length but one reamed with the 300blk and the other with a 300/221 reamer.
I have always been told that you get better subsonic accuracy with the ability to get close to the lands (more even pressure and velocity) but would be curious to see the results to prove or dissprove that theory.
Of course I am assuming you would need to seat your 220/240 300blk loads longer than your documented COALs for an apples to apples comparison so that might not be what you want.
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