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45LC rifle. Micrometer says .4509 on the slugged bore. The slug was actually a Speer swaged 250gr smacked to give some extra diameter for the test. The slug surfaces wore bright on all sides from the test.
With the conventional wisdom calling for a cast .452 boolit, is there any drawback to using .453?
None whatever, as long as it chambers without resistance.
I don't think so with the caveat Outpost75 typed. The truth will be in the trying.
I have a Marlin 45 LC, with a .451 bore, and I use bullets sized to .453. I would use .454, if they would cast that large from my mold.
What's the groove diameter of your barrel? The bullet should fit (or be slightly over) the grooves.