ORIGINAL: Vapodog
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.
Thats funny you mention the 125 grain ballistic, I had my friend stop by a gun shop on his way over to get a box of the barnes bullets the shop didnt have them but the shop owner talked my friend into a box of 125 grain nosler ballistic tips. looks like he will be using ballistic tips. thanks for the help guys