The 'two guns, one cartridge' concept is an old one, and a good one. The problem lies in actual performance. First, what shoots well in one system can shoot very mediocre in another. Fabio may be limited to the classic 158 grain RN .38 special. But if,ie he can get semi wadcutters or hollowpoints that little Rossi may enounter feeding problems, especially in a high adrenaline situation where short cycling ( also a wory with the pump) is a potential problem.