In fact the most accurate non-target grade revolver I’ve ever encountered was a 2nd Generation Colt SAA with 7 ½” barrel. That probably explains their superlative accuracy potential. They have all had barrel groove diameters of about. 357 Magnum Colt SAAs, all of 2nd or 3rd Generations, I’ve never discovered this non-matching problem. Their barrel groove diameters have all been. 38 WCF, and at this point Colt got things just perfect. However, I have owned many chambered for. 32 WCF caliber so I cannot comment on them. I have not experienced a 3rd Generation SAA of. 32 WCF I personally owned had a barrel groove diameter of. The other two “WCF” Colt calibers also suffered from this ailment. 429″ chamber mouths, again in my experience. Here’s an anomaly though, those 2nd Generation Peacemaker Centennial Commemoratives in. 44 Specials) with chamber mouths as large as. 44 WCFs of the black powder era with chamber mouths as tight as. This mishmash of barrel and cylinder dimensions was not limited to. I count this as the main reason.45 caliber Colt SAAs have never had a reputation for fine accuracy. Conversely every 2nd or 3rd Generation cylinder’s chamber mouths I have measured are at least. 451″, although I must say many I have measured are closer to. When Colt brought the round back in 1956 they reduced barrel groove diameter to a nominal. 454″, but I have personally measured chamber mouths as tight as. 45 Colt caliber barrel groove diameters were usually. Colt seems to have always had a problem mating barrel and chamber mouth dimensions. Having had considerable reloading experience with all eight of the above Colt SAA calibers I’d like to pass on some personal comments.
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