Quote:
Originally Posted by MajorD
If the gun has been rechambered to 45 Colt the 455's likely would not fire ( misfire) as the rim thickness on Colt is much thicker than the 455.
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Not so. The benefit of this type of conversion is that both the .45 Colt and the .455 cartridges will headspace properly. The .455 case has a larger diameter and thinner rim than the .45 Colt. Therefore, the .455 rim contacts the chamber face beyond the .45 Colt rim recess.