My wife and I have been hunting Pronghorns for the past (25) years. We get 4-6 tags per year in CO & WY, both on private land. We estimate we have taken about 125 Antelope over the years, averaging (5) tags a year.
We have used 25-06, 6.5x55, 275 Rigby, 280 Rem., and 338WM.
Our favorite (both) is 25.06.
