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Henry, I finally got around to slugging the bore on my Old Army. The bore diameter measures right on .451". This is the modern standard for both .45 Colt and .45 ACP. So, with an R&D conversion cylinder, it should shoot any modern .45 Colt ammo quite well. It was surprisingly easy to push a .457" ball through it, and it does elongate that .006" oversize ball quite a bit.
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Jeff
'72 911T 3.0 MFI
'93 Ducati 900 Super Sport
"God invented whiskey so the Irish wouldn't rule the world"
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