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Hello,
I think on the contrary that 1 turn in 14" can be good with a supersonic whisper. You will probably be limited by bullets of no more than 150 gr flat base.
Just to illustrate my thought:
1 in 14" is the standard twist for 155 grain sierra bullets launched from a 308 win.
1 in 17 or 18 " is the rate used by the benchrest crowd in the 30br with 118gr to 125 gr bullets.
1 in 16" is the rate of the 30 M1 in the usm1 for 110 gr bullets.
You should get good performances with 110 grain to 125 gr.
And nothing stops you from having a second barrel with a 1 in 8" for heavy subsonic stuff.
ND
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