If you do a prairie dog hunt, bring a few 5.56/ 223's, and lots of ammo.
If you are trying to get a long kill in, a 6mm or 6.5 mm of your favorite flavor will keep you happiest. ( I've killed them with everything from a 3/4 ton Dodge diesel, small-medium-large hand guns, 5.56 to 50BMG and evArything in between in rifles)
And don't skimp on glass.
you will be looking through scopes, range finders, spotting scopes and Bino's all damn day.
your eyes will get fatigued.
If you can only bring one gun, make it an AR-15 in 5.56 with a fast twist and 2 grand worth of glass sitting on top.
If you get serous about this, let me know and I'll try and make it.
I know of a few spots in Montana that might still be fertile killing grounds.
And shooting benches are for pussies. Shoot from the ground and plan on hiking allot.
You will get 4-5X the kills in that way. And run suppressed if possible.