Thank you Kiwi! The bullet information is appreciated and the rest I've been doing for about 30 years. My vernier caliper lives on my bench and is used just about daily...I've never needed a gunsmith to slug a bore or make a chamber cast for me nor have I ever needed a tool to determine COAL. You are correct in that the COAL is not what SAAMI calls for and that it is considerably shorter. The Carcano bullets and bore of my M/S both mic at .266-.267. (mine was proofed in 1926 with a 140 gr. steel jacketed bullet). There was no difference in accuracy between the 140 gr SP and 160 gr. RN bullets.
What kind of accuracy are you getting from yours and what kind of sights at what range? With my old eyes behind the stock and open sights I'm getting fairly consistent 1" to 1 1/4" groups at 50 yards off a bench using front rest and rear butt bag. I'm beginning to believe that once everything is factored in that maybe I shouldn't expect any better than that.
Steve, I posted just behind you. I am using the Hornady Interlock 160 gr. RN at .266-.267 and the 140 gr. SP bullets were the Russian at .262-.263.
Vic
Last edited by sharps4590; 09/29/13 11:35 AM.
