The first post in this thread will help you come up with a list of candidate ranges. Personally, if you can figure out which ones are accessible to you and tell us which they are, you'll get plenty of recommendations, pro and con, on each one named. If you're actually at Westheimer and Montrose, you're just SW (as in just a few blocks) from the middle of downtown. Since there are no shooting ranges inside Loop 610, you can just pick a direction and drive. Pretty much every range in town a given distance from you will be equally (in)convenient. Top Gun is almost certainly the easiest trip to make but I chafe at a max range of 50 feet. Other than that (don't take my word for it; verify via the website at https://www.topgunrange.com/range.html ) it would seem to meet your requirements.