Re: Duplicating factory .45 acp
What you could do is measure the OAL on a factory case, read the average fps on the box, then chrono your loads till you have as close to a factory load as you can.
Personally i don't handload for accuracy in pistols. All I do is take the lee .05cc scoop, dip it in Winchester Auto comp and call it good. It works good enough for this guy. It is a little hot but my Para eats it up.