Re: Purpose built Pronghorn rifle
Nimrod, where are you at in the Ozarks? I live in Christian county. As to your question, on a magnum bolt face the 264 WM and the 7mm RM would be my choice due to high BC bullets available. I wouldn't go with the Mashburn simply due to no ammo availability and resale value. If you want higher velocity than the 7mm Rem mag, go with a 7mm STW.
I shot my antelope last year at the mind numbing distance of 250 yards but I was prepared for much longer shots with my STW and 168 gr JLK VLD bullets. It has a #5 Hart barrel and a McMillan A2 stock and at 12 lbs w/scope it is a little heavy to crawl around the prairie with but a slick shooting rifle could be put together much lighter than that.
Lefties are the only ones in their right minds!
(and I ain't talkin' politics!)
NRA Life Member