You should shoot some large caliber handguns like the 45 long colt, 454 casull, 460 Smith & Wesson Magnum, 480 Ruger and the 500 S&W Magnum. Targets should be watermelons, water jugs, bricks, ballistic gel, and maybe something unique that you guys have the creativity to think up.

Maybe they could even try to pierce various armors, like steel plating, or something like that.