My 40-60 is a Chaparral,, don't know about Uberti's ,, mine has a 1 in 20 twist rate,, shoot 208-210 ,, .406 dia. ( 403168 Lyman haven't tried 240 gr. ,, yet ,,) 26.5 gr. H- 4198 ( YMMV ),, shoots clean and very, very accurate . Ditto w/ others ,, ck. the bore size.
smoke'm if ya' got'm ,, Hootmix.