Try this with your BAR.
from a cold bbl, shoot your first shot. Wait 1 minute, then shoot your second shot, then wait 3 minutes and shoot a third shot. I've done this for a few BAR's and the groups got smaller right away.
Barring that try some chap 150's, and cheap 180's if nothing changes, time to go see a gun guru.
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There are no absolutes
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