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My .30cal SRT Shadow is .340" for a .308 bullet. Not sure where the .050" for a FS comes from as the hole size means nothing on a FS so I would give myself lots of room on a FS. I made one for my FN-FAL .308 and drilled it to .344 because it's a common bit and the FS is only 1" past the muzzle.
You are better off staying over bored than risking baffle hits. You are not going to get "hollywood" levels with a thread on. If you want to get the quietest possible you will need to go intregal / reflex / thread on in that order.
Last edited by oregonshooter; 05-13-2010 at 10:39 PM.
Reason: Had .400" on SRT which is waaaaay wrong. sorry!
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Threaded Mode