First off, take it apart and clean it. If you are unsure about the process, find someone in the know. Check for burrs/irregularities on any moving parts.
Source some "handicap" or "supersport" target shells.
Buy a flat and run them through at the local range.
Stay away from 2 3/4 dram shells. Shoot 3 dram (heavy trap) as a minimum.
You might want to stay away from the winchester promotional (cheap) loads too. They use a very soft plastic and every once in a while you might notice "bell mouthed" cases from the crimping process. I have had issues with these feeding in my Extrema2.
Stay away from the Federal shells too - they are dirty and will require you clean your shotgun more often.
Stick to Remington's Gun Club or Kent's Gamebore for lower priced shells.
IMHO.[/QUOTE
i don't buy the cheapy "walmart" ammo. the heavy loads in 2 3/4" #4,#6 in 3 1/4 dram don't even cycle properly. any ammo in 3" and up will cycle with no problems and yes i did clean her in and out, ran it dry and lubed, still the same problem.