My range is a public, general purpose range. I have found lists of black powder clubs including some in Houston but have not found an active one. I will contact that reference you gave (TMLRA) but their range is listed as Brady, in the Austin area. I belong to some Tx Rev reenactment groups and so have contact with some local BP folks but know ofno local clubs in this nations fourth largest city, which is a crying shame.
Where do you get your black powder? To my knowledge, the only place in SE Texas to buy it over the counter is Bass Pro at Katy Mills Mall, fortunatly fairly close to me, but at around $25/lb kinda steep.