I've come into possession of the oft deplored Thunder Five. For those of you unfamiliar with it, it's a .45 Colt/.410 revolver similar to, but coming long before, the Taurus Judge. Looks like the one in attached pics (that I pulled off Auction Arms).
They also made it chambered for .45-70 <This is the one I'm curious about.
Now to my question. The .45-70 seems to be unanimously aggreed as a worthy big game/bear-defense cartridge, but this is generally out of rifle-length barrels or at the very least 10-14" barrels found on big-bore hunting revolvers. However, being a rifle catridge using slower burning powder, I understand that velocity is going to be decreased significantly in these revolvers. The Thunder Five has a 2" barrel. What kind of velocity loss can be expected here from the powder not having time enough to burn up?
I'm not neccessarily looking for numbers here, but would the round have enough energy out of that short a barrel to retain a place in the same league as the .454 Casull, 500 S&W, and similar? Could one still count on it to stop large attacking predators of the 4 legged variety (perhaps a bear)?
I've searched high and low across the net to no avail. It seems the very idea of a .45-70 out of a 2" revolver is so absurd no one even bothers speculating about it. So here I am, asking for those of you heavy into ballistics and reloading what you might speculate. Fire away.
PS: I have no need whatsoever of a bear defense gun, this is purely a hypothetical. I also don't have much intention of firing this weapon, as I shudder at the very idea of what the recoil might do to my hand. Just a question of shear curiousity.