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30BR or 30BRX subsonic

-Time-

Mediocre Marksman
Full Member
Minuteman
May 6, 2017
190
86
Is anyone running these at sub and super velocities? How finicky are they, and how efficient are they?

I’m debating hard about going this direction for a 300blk imitation with better supersonic capabilities, hopefully 155’s closer to the 2500fps range.