Quote:
Originally Posted by Oyeboteb
You might want to check your Groove-to-Groove diameter of the Barrel Bore.
Some of the 2nd Model H-Es in ".455" were .455...some, .456, even .457...
.45 ACP and modern .45 Colt, the Bullets are .452, and would not even touch the Rifling in such Bores.
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Actually 45acp bore diameter is more like .445" and the groove diameter is .452" A 455 probably has a groove diameter of around .448. You would need really worn out rifling to get zero engagement. Slug will get some spin, might lead a bit. Copper jackets would probably not slip much, soft lead bullets might swell a bit from pressure and forcing cone. But, your correct in that it is not the best.