What is confusing to me, and the reason I asked, is that nearly all the hard-cast .45 Colt bullets are .452" which I believe is the same as the .45 Colt bore size, but generally speaking it is recommended that lead bullets be .001" over bore diameter. Dardas is the only bullet manufacturer who offers a choice of .452" or .453"

.45 ACP and .45 Auto Rim have a bore of .451" so .452" bullets are fine there.