For that matter its probably not a good idea to shoot snake shot in an automatic because there isn't enough recoil to cycle the action properly and the next shell can jam in sideways, fortunately this doesn't set them off. I heard that with 1911 .45s that you have different springs for different loads, like target loads vs combat loads. <img src="/forums/images/graemlins/crazy.gif" alt="" />

Back to the thread - the most ultralight ammo is a .22LR
Jim <img src="/forums/images/graemlins/cool.gif" alt="" />
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These are my own opinions based on wisdom earned through many wrong decisions. Your mileage may vary.