do you have an 'old' '66 ? what does it like? .454? in SASS Wire Posted May 25 My '66 Carbine is from 1994, the bore slugs .4535 diameter. I have always fed it .454 diameter bullets from a Lyman #454190*. Never had a problem. Groups 5rds into 2 1/2" at 50yrds from the bench, just resting both elbows on the bench. I had a brass "top/bead" added to the front sight and a Williams Full Buckhorn rear sight. Did the same thing to a 1988 '73 Carbine in .44WCF. *Cast of 50/50 COWW/#2, Lubed with White Label Lube's BAC. Sized & Lubed in Lyman 450.