StrawHat,
I have another thing that you might have some insight to. I Don't know if you have ever looked at the SAAMI specs for the .45 ACP, they have two, one is for a "Match" chamber.
BUT, there is also a strange specification for the .45 Auto Rim. Look at the bullet diameter and the huge allowable throat dimension. Oddly they have a smaller Groove diameter of Ø.4512 +.004/-.000 and a larger Bore diameter Ø.444 +.004/-.000 than the standard or match chamber .45 ACP. That has to be the direct result of the S&W chambers and information they had on the original 1917 specifications.
I mean the bullet diameter can run from Ø.446 to Ø.452 (
) and the throat in the cylinder starts at Ø.4555 and runs to Ø.4595. I have no idea how they got that, but there is a reason.
Comments?
~Mako