The unusual nature of pronghorns and the open habitats they roam suggest a fast, flat, wind resistant cartridge and bullet combination. Is the best a 6mm, 25-caliber, or 6.5 caliber?

Are you sic of new rifle cartridges? Wish they just make enough of the old ones? Well don’t hold your breath while you wait. Ammo designers have been cranking out new, redundant, and sometimes superfluous new cartridges for more than 150 years — and show no signs of stopping. Meet some of the forgotten rounds of yesteryear.