So what diameter is the 45 Colt? I know the stories about the historic variability of both the chambers and the barrels. But I think 100+ years is long enough to settle on a diameter. The reason I ask is most lead bullets are sold at 0.452" which should be in theory 0.001" over the bore diameter. So why does Hornady & Winchester sell their XTPs at a diameter of 0.452" (Sierra at 0.4515)?