I must confess I have only shot a Bisley grip once for a few rounds.They were hot 357s,so I assumed (I know) hot 44 Mags would be worse.This thing seemed to hit as hard as factory 44s.I heard the same opinion from a few single action shooters,so I thought my opinion had some basis.Sorry for not actually testing my opinion to prove it.
Speaking of a heavy hitter,this is a cool one.A friend,with the help of another that was a machinist (and worked for Colt years ago building Pythons,etc.),built a wildcat out of a 45-70.He started with a 357 Blackhawk,made a 5 shot cylender and redid the lockwork,cut 8" off his Ruger #3 45-70 (that almost made me sick),threaded it and screwed it in front sight and all.The round was a trimmed 45-70 case shooting a heavy (425gr?,can't remember exactly) bullet.The loaded round took up the full length of the cylender.I don't remember the powder or charge he used,but this thing hit hard at both ends.Two hands with a very braced hold and this thing was coming at you fast,hard and literally was pointing beyond straight up.One cylender full and I was done,but I never saw a bowling pin come off the table and slam the berm so hard and fast in my life.Almost gave me a woody.I asked him what he made it for since target shooting isn't an option and there aren't any really large game animals in S.Florida other than black bear (and they're small down this far).That was it,he was tired of coming up on bears while hiking and wanted more than a 357 or 45LC.I think this might ruin their day.