I’ve shot pronghorn with different cartridges. I don’t think I’ve ever used a belted cartridge so far. 6mm on small side and 280AI on the large side (308 included).
I think a 6mm or 25-06 would be my favorites. Maybe if I re-barrel a rifle I might make it a 257 Wby and try that.
Pronghorns are not large animals. I’m thinking their bones are stronger/tougher than deer though. Hit a leg bone and you’d be happy you used a proper bullet.

I prefer classic.
Semper Fi
I used to run with the hare. Now I'm envious of the tortoise and I do my own stunts but rarely intentionally