I have been using the Sierra hollow cavity 140 gr. bullets-these are the older bullets -Sierra has a little harder lead in their bullets-or at least use to-I'm almost out of these though,...my Blackhawk-6 1/2 barrel is shooting these over 1700 f.p.s. using H110 19.5 gr. -this load is from the older speer manual #11

H.H.I.#8190 Colossians 1:17 And He is before all things,and by Him all things consist!