We had one long shot in our group that went- about 330 yards.. But in my limited experience a pronghorn hunter should be prepared for a 300 yard shot. Any modern rifle is capable of this. All it takes is some practice.
We were in some really open country. Stuff eastern hunters can't even imagine. So having the option to shoot a couple hundred yards was a good thing. I believe mine was 267 yards. Another one right about the same. And then a fourth around 175 yards.
Could I have gotten closer? Not on the buck I took. He was alert and about to head on out of the county. On other ones, yes.
-jake