IIRC, aren't you in the HSV area?
If so, you have the national forest rifle range near Cedar Fourche.
You also have the national forest rifle range at Bear Mtn, near Brady Mtn in royal. Both are 100yd ranges.
If you are looking for longer ranges, the only place I can think of possibly is off Gladstone rd. Take hwy 7 north, past the iron mtn use area. The road number is 11, on the left almost directly across from Winona forest drive. Follow road 11, for a few miles and there is a pipeline. Please check though, I'm unsure if it is still national forest or not. It was the last i heard. Been a year or two since I been thru there.
Now there is PowerLine right of way off Winona forest drive, but it is in Winona wma. I don't know how pissy the AGFC get about shooting out of a hunting season.