I think....
In actual practice, you won't know until you try em.
Coupla reasons.
Roundballs - I have measured roundballs from Hornady (for example) and I find that the ball to ball diameter is not that consistent. I can't remember standard deviation of diameter of a sample of 100 balls (I think it was north of .001) but I do recall that it was, a) more than I thought it would be, and b) higher than balls I cast myself when I was being very very careful.
The pistol - I don't know what variation in chamber diameter one might expect from pistol to pistol. Machinery set-up, tool wear, operator in a bad mood, etc.
The lead - Force required to seat the ball (IMO) has a lot to do with hardness of the bullet metal. There are folks out there who shoot cap and ball revolver a heck of a lot more than I do and to them this may be part of shooting dogma. If these are soft bullets, you might not even notice much of a difference. I cast all of my round balls now and never measured hardness on a bought ball, so I don't know.
I don't shoot .457 in anything but ROA, but I would not say it is impossible. In the end, I think you won't know for sure how you feel about it until you see how hard it is to shave lead.