11-03-2023, 01:34 PM
Gonna say, a bore brush works fine also for doing the measurement, whatever is handy. It was interesting to do this on (in?) my 1894 Marlin 44mag one time. 20" barrel and the rod just made it about half way through one spin before the brush came out the muzzle. LOL The rifle's got a 1:38" twist for some reason. I don't know why Marlin made them that way. It shoots okay for the kind of rifle it is, but it's certainly no tack driver.