Gee`s..go to Sheridan, Wy. Talk to the F&G people. Office is just off the interstate...LOTS of public land you both can tramp...dogs up the A--. Been doing that for free the last 5 years. Fact, west of town bout 5 miles is a public shooting range, next to it is Wy NG property..F&G will give you a free permit to walk it and shoot dogs. Think that`s a bit more land...but last year three guys from Va. set up right off the road and shot dogs for three days.
There`s a big town on public south on 14 out of town, about 10 miles..6 or 7 sq. miles of it. Dog town is about 400 yrds wide, 1k long.
Shot that quit a few times. I shoot prone off bi-pod and rear bag.
No need to pay if you can walk a little... and ask some questions.