muley69,
There are many fine antelope cartridges.
.25-06
.270 Win
.280 Rem
.30-06
.264 WIN Mag
.308 Win.
I've taken antelope with all of these and would be real happy to use them again.
The only cartridge I've used with less than stellar results was a .243. The 100 grain Sierra didn't go through the shoulder on a diagonal shot. Spent the rest of the day getting him. Good luck.