Richard Eames said:
Not sure how ball diameter could affect velocity.
Maybe Alan will help, he has more experience than I do.
I'm just at Noob at C&B but I do reload for my pistols and rifles. One thing I thought about is with say a .457 ball, you shave more lead ring off and then the ball will have a longer flat spot around the circumference. I would expect there to be more ball in contact with the rifling and thus change "something" with the way it acts in the barrel with how soon it leaves the barrel,how much powder is burnt and such.
I would expect it to act differently than a .451 ball that slices a tiny ring. I can now see how Chamber diameter and bore characteristics for Lands and groove diameters comes into play. Interesting suggestions.
I am not trying to be a match shooter, but I'd like the pistol to be more accurate than my shooting so I can work on my shooting. I'd be happy with 5 shots all in the black at a 3" circle @ 25 feet offhand