Rojosy,
You'd look great in polka dot loafers!
45/70 (as in Elk's screen name) is a rifle caliber. First developed as a black-powder cartridge in the post Civil War era, it probably took more Bison than all the others combined, with a low velocity and a massive bullet weight of 500 grains.
It still is around today, and is used usually in a souped up form with higher velocities and lighter projectiles.
I'm just particularly (read overly) proud of the family heirloom I've got.