One of these recently followed me home. Shoots 12-15 shots well with HSM factory ammo but leads badly. Probably due to .3790" boolit that's hard cast but it makes empty Starline brass for now.
Upset slug shows a .3810" throat with .3795" grooves. I'm thinking a mold that drops .3185" to .3825" then size to .3810" should work. Since the original spec was for 255gr boolits and it shoots the 255gr factory stuff well aside from leading with very mild recoil I'd like to stay in that weight range. I've seen recommendations for Accurate Molds 38- series of their 250B, 285B and 320E. Has anyone shot these from a Uberti? How do you like it?