Back when God was a Boy
and you could compete with a real revolver in IMSHA, I used a Model 57 loaded with a H&G 225 gr bullet, cast of lin-o-type, over 21 gr of 296, for circa 1,300 fps. Have shot thousands since with in a 657 Classic Hunter with no ill effect.
Please remember, a 57/657 is a stronger gun than is a 29/629. After all, less metal is removed from the same diameter cylinder to make the chambers. And less metal is removed from the barrel also.