No problem with the .457" dia balls as long as they are of dead soft lead. I've not yet seen a 44 NMA that didn't do well with .454 dia balls but I have shot .457 w/o any problem. The larger ones are a little harder to ram but real hard lead could bend or shear the rammer pivot screw.
With over 15 perCUSSIN' revolvers, I've been called the Imelda Marcos of cap & ball.
SASS#3302 (Life), SASS Regulator, NRA (Life), DGB#129
Wolverton Mtn. Peacekeepers (WA), former Orygun Cowboy (Ranger, Posse from Hell)