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Old 11-29-2005, 04:34 PM   #1
 
Join Date: Jun 2004
Posts: 72
suppressed custom

i am 20 now but over the next year i want to build a .30 cal bolt gun and suppress it. my question is about rate of twist and subsonic ammunition. i want to mainly shoot subsonic ammunition but i want to also be able to shoot full power ammo too. what twist rate will stabilize subsonic ammo? i have read on other forums about dedicated subsonic 308 guns using a 1:8 twist. is this too fast? the lightest supersonic ammo i plan on using is 175gr. also does anyone here handload there own subsonic ammunition.
straightshooter86 is offline  
Old 11-30-2005, 05:30 PM   #2
 
Join Date: Oct 2004
Posts: 3,092
From Engel Ballistic Research.

Moe

http://www.ebr-inc.net/WhitsCorner_Articles.asp?wcid=2

Quote:
For dual use (i.e. both supersonic and subsonic ammunition), the very best compromise is a 1:10" twist rate. Our extensive testing has proven that there is NO accuracy degradation with supersonic high-velocity ammunition, and that with the correct subsonic ammunition, this twist rate will give more than acceptable, sub-minute accuracy.

For use with subsonic ammunition ONLY, a 1:8" twist rate is best. This gives added stability and permits the use of less than optimal projectiles. The use of the 1:8" twist will mean that this gun is dedicated solely to the use of subsonic ammunition.
mjmensale is offline  
Old 12-01-2005, 10:08 AM   #3
 
Join Date: Jun 2004
Posts: 72
thanks
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