Georgia Arms has a new 41 Mag Cowboy load, which is not really a magnum load (800 FPS), and It really accurate through my M57 no-. Smokes a lot and the gun is pretty dirty, but it's fun to shoot. Very mild and accurate. $23 for 50.

I don't know, 800+ FPS with a 210 grn LSWC, seems like a pretty good two legged varmint round to me...plenty control, if it shoots well, seems like a great idea