A jacketed bullet for 45ACP are .451; cast should be at least .001 over barrel diameter. Most commercial cast bullets are .452.
As too what bullet your gun shoots you would need to slug the barrel to say for sure.
Many things go into what size bullet a mold will drop.
I am assuming you are talking about Lee molds, most new guy’s to casting, go with the Lee tumble lube bullets.
They are the cheapest start up.
Lee advertises that most of the TB bullets may not need sized. If you want to be on the safe side, without slugging the barrel, you can get the Lee sizer in .452 and run them threw it.
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