From 1873, until just prior to World War II, the .45 Colt had a bore diameter of .454". Post war production changed to .451" - .452", duplicating the .45 auto. Modern cast bullets available through retail always seem to be spec'd at .452-.454", however, cast bullets always run a little larger. Jacketed bullet size seems to vary depending upon the manufacturer; Speer .451", Hornady .452" and Sierra fence straddles at .4515"
Either .451 or .452 will shoot out of a modern ACP or LC. There really is no telling which your gun will like until you try both.
Glock pistols and cast bullets are supposed to be a no-no because of the Polygonal rifling.
Plated bullets like Ranier and Berry are said by some to follow along the cast line and are supposed to be bad.
That stated, I have run cast and plated bullets in my Glocks with no ill effects. Just clean them good when your done.
The Berry bullets like slower velocities in my experience and are harder than Ranier.