I never thought about getting lead from a dentist, that's a neat idea.
I use a .451 ball in my gun but I've been thinking about the .454 I like the idea of a little heavier projectile and I read somewhere that the larger ball engages the rifling in the barrell a little better and gives better accuracy. On my last shopping trip for supplies I bought 200 of the .451 balls and I have probably 60 or so left over so it's about time for a shopping trip again,
I may just get the .454 this time and try them out.