I'm pretty sure the 45/70 would insure you would end up eating T-Rex steaks.
I always used to wonder, what WOULD a dino steak taste like?
Didya ever notice, in ANY movie where the "heroes" face, for whatever reason, dinosaurs, that nobody EVER seems to think of simply picking up a gun and shooting the damn things?
The Jurassic Park movies were even WORSE...at NO TIME in eany of them did ANY gun ever work against the dinos. Hell, in the first, the "hi-tech" park's only weapons (with huge, multi-ton carnivorous animals about) were...SPAS-12 shotguns, which were shown to jam at the wrong time.
The SPAS-12 manufacturer should have sued the filmmakers for libel, IMHO.
Then I could find out f they taste like chicken.