I'm in if there is a SE Texas event. This sounds like a "blast", forgive the pun.
There was a "charity" event locally for an African community program that was an "African" caliber only shoot with reactive, running and charging targets. I heard of it too late, but understand it included many .375 H&H, some double rifles and a variety of nominal .40s and .458 bolts.
Please post if there are any coming up.