Re: TRG 42 OAL
Just seat the bullet long, then try to chamber. If bullet touches rifling, seat it another .010 to .020 deeper, and try again. Once the round chambers without resistance and marking on the bullet from the rifling, you are there. You can then seat another bullet a little longer to test it again and see if there are any markings on it. Then take not of your OAL, and go from there.