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Old December 25, 2012, 11:59 AM   #9
Bart B.
Senior Member
 
Join Date: February 15, 2009
Posts: 4,804
jmr40's absolutely correct for short, blunt and low velocity bullets. For example, consider the .32-40 which was a favorite black powder round for competition over a century ago. For 1:16 twist in one, you should shoot the lighter 150 to 170 grain bullets at those 1400 to 1500 fps speeds. A 1:14 twist is ussually what is required if you wish to shoot 200 grain bullets in a 32 caliber and a 1:11.5 twist is what some are using to shoot 235 grain bullets at less velocity.
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