RE: Antelope load for a 308 win
For the .308 on pronghorns I'd be very tempted to use a 150 Ballistic tip from Nosler or a SST from Hornady. You can drive lighter bullets faster but they really don't get you much better tradjectory.
Either of these bullets will be fine on these small animals and if you don't care about big holes in the hide a 125 Ballistic tip will work as well.