There is the Lafourche Sheriff's range off of 182 outside of bayou blue, there is a nice 800 yard range in Galliano called Eymard's shooting academy, there is also a nice range in thibodaux called Southern Shooting Center.
Lafourche Sheriff range is on 182 at hwy 90. Open to the public Wed-Sun 8-5. $10 all day. Memberships are also available. Pistol range, rifle ranges 50/100/200 yards. Clay area, bring your own thrower for now. I heard talk of them redoing clay area and adding archery area. Targets are available for purchase but no ammo sales.
Its between 311 and Bayou Black Drive. Right past the new Valhi extension. $5 a day. $25 a year. Sight in only on rifles. They hate ARs. Have a pistol bay. FWIW Wife works for TPSO and we go to LPSO range and are considering getting a membership at Southern Shooting Center in Thibodaux.