I'm not sure if they are "game bore" but both Poly Wad and RST carry 2" shells for vintage guns. I forget the exact web site address but you can find both if you google polywad and RST. I want to say they cost about $85 or $95 for 250 shells. RST may sell them in smaller quantities, but polywad only sells their "vintage" shells in bulk 250 shell boxes.