We figured the only way to really make the platform work properly was a rimless metallic cartridge system. That also makes belt fed pretty easy
The problem is, as mentioned, is that in the Grand View, 3-Gun isn't even a rounding error (in the number of shooters per sport nationwide). Making the setup costs work out as even a break-even project are not particularly viable. Without the ammo companies on board, an entirely new line is just not cost effective.
Alex
Rimless metallic would be awesome for detachable magazines, too. Rimmed cartridges and box magazines aren't the best combination...