I had the same problem only with light loads 2 3/4 inch 7 and 8 shot. these were just cheap target loads. I bought a box of six's with a little heavier shot and a larger dram # and havent had the problem since. I wouldnt be discouraged its not a bid deal. Now that I have had the gun for a while and its broken in it will shoot the same loads that were jamming before.