Originally Posted by arcticap

The chances are that the revolver and the single shot pistol take different size balls.
The revolver is an 1851 Navy Model .44 that uses either a .451 or .454 round ball. The single shot .45 would probably use a .440 round ball with a .010 or .015 patch.
So neither gun will be very easy to load with .457 round balls.

It's important to not load too much powder in the chambers of the brass frame revolver or risk damaging the frame over a period of time. That's because brass isn't as strong as steel and the recoiling of the cylinder will leave indentations/impressions in the back plate of the frame. 25 grains of powder is about the max. powder charge without putting undue stress on the brass frame, at least for shooting on a regular basis.