17-04-2014, 05:44 PM
Do you have any figures for the weight loss that occurs when the Carcano bullet with the thicker jacket is fired thru the MC 91/38? (Harold Wiesberg estimated that weight at half a grain.) You would suspect that a rifle with deep grooves would inflict a higher weight loss on the bullet as it carves out the rifling marks on the bullet than a rifle with shallower grooves. I don't recall anyone but Howard Wiesberg (a fair bit of time ago) adding in this "end-of-barrel" weight loss with the bullet fragments recovered from Connally to determine if CE 399, the magic bullet, was of the proper weight to have left all those fragments. Half a grain seems pretty significant to me.