Caleb spotted a fellow IDPA competitor using .45 GAP cartridges in a revolver! I had never heard of such a thing before.
The .45 GAP (Glock Auto Pistol) was designed to duplicate the .45 ACP ballistics but in a shorter cartridge more suited to high capacity semi automatics. It is the last thing I would have thought of using in a revolver, but the owner of the wheelgun had some good reasons.