Kudos for giving an intelligent answer. I have seen folks answer questions like that based on pure guess work, not a good thing.It looks like .45 but if you get a caliper and measure it. .452 is 45.
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I wish no ill on anyone. So if I can't answer appropriately I won't. But in this case I load 45 acp and 45 long colt weekly. So I knew them 100%Kudos for giving an intelligent answer. I have seen folks answer questions like that based on pure guess work, not a good thing.
45 Colt. Colt .45 revolvers made until early WWII had barrels with .454" groove diametersWhat if it had been 454?
45 Colt. Colt .45 revolvers made until early WWII had barrels with .454" groove diameters
.456 woulda been 45-70. which they clearly arent looking at shape.