Some of you might remember my posting some months ago from Afghanistan about getting into casting for the first time. I've been home almost a year now, and have cast at least a couple thousand boolits using 3 different Lee 2-cavity moulds. (I'm a cheap-skate.) I have only had trouble with one of them so far though, the 228 gr. .45 ACP mould.
It fires just fine as a light-load using trail boss powder in either my S&W 460, or my new Ruger Bisley Stainless convertible. Only in 45 Colt in the bisley though.
I decided to find out why this particular boolit doesn't like the caliber it was designed for tonight. So I dug out my Mitutoyo dial caliper, and three different factory 45 ACP loads, along with two different 45 ACP handloads. The differences in measurements were only a few thousandths of an inch, but the boolit itself was very nearly the same diameter as the case neck.
I think this is my problem with this particular boolit. I think because a semi-auto (like my Para-ordnance 1911) and my Ruger convertible head-space on the case neck, the similar diameter of the boolit is keeping the cartridge from seating all the way in.
I'm guessing a .451 sizing die for the same boolit might solve my problem. I can't seem to find one for decent money though.
So for now, I have over 200 useless cartridges loaded for 45 ACP. (And I was so SURE buying the Ruger convertible would help me out!) Oh, well - at least I wound up with a fine revolver!