A rodda .500 3" is the Nitro Express, isn't it. That, of course, is in a slightly different league than the .458's and of course, badly outclasses the .45 and .50 cal BPE's.
; As far as the .577 BPE, it is reported to run 650gr. bullets at around 1,650fps. Given hardened bullets having enough penetration, it would work splendidly on all of the bigger game animals.
: Even Baker noted that a hardened ball from a 14 bore round ball double rifle, with only 5 drams (or maybe drachms) of BP would exit an Indian elephant's head. "through and through" were his words. I found my 14 bore rifle only produced 1,770fps with 330gr.2F, a mere 70fps over a 265gr. charge, so the extra powder is minimal. I think perhaps Baker meant drams afterall.
: With a mere 6 drams of 2F, it drove a ball through 30 yards of willow branches, through a rib and smashed the off shoulder of a bull moose at a range of 100 yards. The initial velocity was only 1,550fps.