That’s the science. The faith-and-wizardry element will come into Enjoy since there’s no definitive way to test the precision of a different barrel with and without crack-in. Regarding the effects of rounded rifling on accuracy, the rifling provides an angular velocity to the bullet so applying abrasives near the muzzle https://judahcijkj.ivasdesign.com/57337298/details-fiction-and-telc考试报名