The standard .308 twist is 1:12" some match/Sniper barrels are 1:11" to handle 175 SMK's any faster twist is only for the real heavies like 230 grains
if you only plan on using subs occasionly it would make sense to build it to handle the 150 to 180 grain bullets that are the standard for the .308
subs only have a limited range no matter how streamlined they are they drop like rocks.
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