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Ideally you want the chamber throat to be .001" larger than the bore and the bullets should just pass thru the chamber with moderate finger pressure. This will generally produce the best accuracy. Most old Colts have throats in the .454 to .457" range and bores that are .452" or slightly larger. I then size to the largest possible size-- .454" and let the bullets swage down in the barrel throat. The intent is to get the bullet into the barrel in the straightest line with bore and avoid tilted bullets coming out of the cylinder. Rich
 

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Discussion Starter · #3 ·
So in this case, and assuming the bore is .001" smaller than the cylinder throats, a .452" bullet would work better than a .451" bullet...Am I following you?

Would this mean that .452" bullets would be the optimum, or does it mean that .452+ will all work?
 

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start with a .452 and if that doesnt work for you then investigate further.
 
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