22 LR .2195 2255 14 2 deg 52 min
25 ACP .251 .2525 16 2 " 49 "
30 Luger .3015 .313 9 6 " 12 "
32 ACP .3015 .314 16 5 " 37 "
32-20 .3015 .314 16 5 " 37 "
32 SW .3015 .315 18 5 " 34 "
357 Mag. .3515 .360 18 6 " 28 "
38 Spec. .3515 .360 18 6 " 28 "
38 SW .3525 .364 18 6 " 26 "
38 ACP .3515 .359 16 4 "
380 .3515 .359 16 4 "
9mm .3495 .357 11 5 " 45 "
38-40 .3965 .404 16 4 " 30 "
41 .3965 .404 16 4 " 30 "
44-40 .424 .430 16 4 " 45 "
44 Russian .424 .430 20 3 " 52 "
44 Spec. .424 .430 20 3 " 52 "
45 ACP .4465 .454 16 5 " 2 "
45 Colt .4465 .455 16 5 " 2 "
455 Web. .4515 .458 16 5 "
The twists that are used in the above listing are standard factory twist. The finish groove size given by
the rifling button will give the correct diameter if the steel that is used falls in the range of 30 to 32 Rc. If
you use a steel of 28 to 30 Rc, the groove diameter will be slightly larger, and harder steel will be slightly
smaller Diameter.