Run it over the chrony before and after. Be interesting to see results
mine has a 19inch barrel (shortened before i got it) at that length it needed to be suppressed just to loud. good overbarrel and is now my go to rifle still getting 2800+ with out too much load work yet.
cheers john
Doing that to a 7mm Mag is just plain wrong, maybe you could engineer a swap for 7mm08 or better: 308 or similar, as for projectiles, at the sort of ranges you indicated, Sierra Prohunter would be great, cheap, accurate in any rifle and not fussy to find a good working load.
Swap it for a short range rifle. 7mmRM is a 26 inch barrel item, preferably.
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