Shot one a few years ago at the shooting fair. We had 5 BFR's in the booth.
45-70, 500S&W, 444Marlin, 450 marlin, and I think 30-30.
but we were shooting all one handed, except the 450 Marlin. the idea of an elephant round special out of a handgun scared me and did not sound fun.
The only down side I can see to the 500 is the long cylinder for a short case and all the free bore.
But it did not seem to hurt the accuracy out to 40 yards (end of the range) and we were shooting heavy loads.