Does anyone know of a 300 yrd range in or near BR?

Do not know of one.  

Let us know what you come up with...

I'm pretty sure the Ascension Parish Sheriffs range goes out to 300.

www.ascensionsheriff.com/div_training.htm

The APSO range does have a 300 yd range.  

The new facility near Donaldsonville goes out to 600 if I remember correctly, but you have to be a member, or a guest of a member to go there.

www.southernshootingcenter.com/

From their site:  

"Welcome to Southern Shooting Center.  We are located at 979 Hwy 3185 Lot 199 in Thibodaux Louisiana.
Click here for a map.

" Our beautiful new facility boasts a 300 yard rifle range with 30 covered concrete shooting benches, 12 pistol bays, an elevated archery bay and a 5 man sporting clay installation.

" We host a number of shooting competitions including; Practical Pistol matches, IPSC steel plate matches, Cowboy action shoots, I.C.O.R.E. Revolver matches,  Rimfire bench rest matches and Varmint Matches for competitors from novice to master class.

" We are open Tuesday through Saturday 8am-6pm and Sunday 9am-6pm ( or dark, which ever occurs first).

" We are closed on Monday. We are closed day before and day after MAJOR holidays and also closed on the days of Mardi Gras, Memorial day, July 4th and Labor day.

"For further information call (985) 448-1147"

This is a "black rifle friendly" range.  

There is a group of AR-15 shooters who meet there every 3rd Saturday, but I was not able to contact them.