Location: The rifle range, or archery range or behind the computer in Alaska
Drew my first antelope tag ever!! Nevada 065
Just have to decide: 6.5x284 or 300 win mag....I'm thinking 6.5
Long range shooting is a process that ends with a result. Once you start to focus on the result (how bad your last shot was, how big the group is going to be, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.
Just to be contrary I'll go with the 300 Winchester. Now that you've drawn you go on a five year "probation", by the time you get your points built up again. This could be a lifetime tag. My favorite Antelope load from 6mm to 375 is a 300 with a 200 grain bullet with a decent BC. Guess a wind call a little wrong, and even just center mass it anchors them right there. Also, Nevada Antelope are not nearly as populated as Wyoming making for fewer opportunities. I've read enough of your post to know, you know the rifle end of it as well or better than I do, and the question is mostly being sociable, but if you really want to take the 300 you're not the only one. Just guessing at your dates, but my one Nevada Antelope was late August-early September the rut got more visible everyday. Temperature sensitivity will play a roll. A rifle cooking on the front of an ATV all day will get damn hot.
Took a pair last fall with a 300 win and the 215's from the same herd. My two farthest shots on speed goats. First was at 1005, the second was at 1285. Bullet performance was awesome with complete pass through on both and both with nice 1 1/4 to 1 1/2" exits.
Antelope are the perfect long range game. They are out all day for the taking. And they are usually in open areas to watch them fall or for a follow up if needed.
They also eat very good too. We take between 6 and 8 each year. Knock the bark off them, 1/4 em and get them on ice asap.
I would try to get a doe tag or 2 and take both rifles. But I would probably use the 6.5 for a back up.