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.451 & .452

I am new to reloading and am confused by the .451, .451 and .454 calibers for bullets. When reloading for my Glock 30 what is the proper caliber. I realize we are talking about thousands in variances but where can I determine best fit.Thanks

Jacketed bullets should be .451"-.452" diameter. .454" diameter bullets are for 45Colt revolvers.

Yes but which one? I have the same question about .45acp. Should I use .451 or .452. Does it matter?

.451" is most common for jacketed bullets. For lead bullets, .452" is more common than  .451", but both are used interchangeably.

Thanks!!

I have a Dan Wesson 1911 with a match barrel and it will only chamber .451 bullets reliably.

.451" is the standard size for a jacketed projectile for .45ACP. .452" is the standard size for a lead projectile for .45ACP, and a plated projectile can be either .451 or .452". .454" is for 45 Colt revolver, the cowboy sidearm.

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