Scott, don't know how much I can help as I've no experience with nekkid round ball. A few suggestions if I may. Speer .430" round balls, lube with thinned Alox and dust with motor mica or graphite prior to seating. Start with 3 grains of Bullseye under the ball. Seat to ball equator and use a mild taper crimp or lacking that die a gentle kiss with a regular crimp die.
Somewhere around 2 grains of powder they sound like a healthy beer fart from a rifle. Dunno you'd expect that with a revolver. LPP primer BTW.
You might get some leading out of this if you try to run up the velocity.
You can make RBs run at 2400 fps but you can't hit a barn if you're standing inside.
