I have a quick question about my new purchase. I recently bought a older Remington 1100 chambered in 3" magnum and i have only put 5 shells through it but they did not fully cycle. The shells that i was shooting were low brass the kind that you buy in bulk say at wal-mart to shoot at clays. Is the cycling problem because of the low powered shells or is it the little o-ring that wears out. I'm not familiar with the magnum guns do i have to shoot the high powered shells? Any help would be appreciated.