.45 LC vs. .45 ACP

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You are lucky you got anything better than patterns with the 9mmthings cylinder. Mine has. 358" throats,which is pretty oversized for. 355" bullets. In spite of that, mine actually shoots CCI Blazer quite well.
 
Two S&W 45s

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The 45 ACP is chambered in the top revolver. Both are accurate and easy to handle. For years I preferred the ACP but recently have begun to favor the long Colt chambering.

S&W has been building target revolvers in 45 ACP for decades. And they shot well with or without clips. It was not uncommon to see competitors unloading the ACP empties from the cylinder with a short rod, very carefully.

That said, when Ross Seyfried had a MOA revolver built, he chose the 45 long Colt for the chambering. And got one inch (or less) groups at 100 yards.
 
Gee, I think someone did something right.
And I've got a New Frontier with .457" chamber mouths but it still manages to shoot a .452" 250gr RNFP over 9.0gr Unique, or a .452" 275gr LFN over 2400 into one ragged hole at 25yds. However, you can't always expect a sixgun with grossly oversized chamber dimensions to shoot that well.
 
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