What do you guys with mossberg 930's use? I picked up a 930spx and took it to the range. I couldn't get more than 3-4 rounds in a row without a jam. I was shooting 2 3/4" #6 shot, 1390fps stuff. I put 40 rounds through it. I think it was short cycling. I bought some #8 shot rounds today loaded to max dram. Between that and some 3" shells I have here I'm going to beat it in to submission. What do you guys get to cycle reliable in yours? Did you have issues when yours was brand new?