I really don't have a problem with anyone bringing any gun that they want. BUT, I would prefer if your main rifle was a .22 centerfire (or even a .244 cal).
The reason is, with the larger caliber guns (.30 cal and larger), you are more likely to have a riccochet. There will be some farm houses and/or barns around this area, and the more riccochet's we have, the more likely we are to hit one of them.
So, if you want to pop a few with your pet .308, or even your 45/70, I have no problem with that, just make it limited rounds down range. Besides, believe me, you're not going to want to shoot prairie dogs all day with a 45/70 :eek: