From the begining i shoot with rocks but 2 weeks ago i bought marbles. I choose my rocks to be almost the same size and weight. I thought i will be more accurate with marbles because of the shape but i am not. From 10 metres i hit 4 times on 10 with marbles, same distance 7/8 on 10 with rocks. I can' t figure out why. Do someone have an idea?<br>I shoot on cans.