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Could be surface rust, carbon or other gunk, or an invisible slightly tacky coating. In all instances, club and shooter's guns, hard to open actions were traced to a buildup of something on the chamber walls. For 4-H trap we used the promos we could get the best deal on, Federals, Winchesters, whatever. My chambers are cleaned and lightly polished FWIW. I guess I need to use up the shells in the guns that will eat them and avoid them in the future. Even the cheapest Federal shells do not exhibit the problem. The Winchester shells you mention are the ones I have the most trouble with. Some manufactures have started chrome lining the shotgun chamber to basically hard plate the chamber ID. Steel does not expand and contract like brass and the expanded steel section may be creating a hull that is hard to extract. Many rounds of this type ammo could have generated the internal ring or recess. That is no longer the case as some of the steel rims used on the shells today are stronger that the barrel steel. When shotgun shells all used a brass head, the brass was much softer than the steel. Years of shooting steel head shotgun shells could have created a slight internal ring in your chamber. If the problem still exists then check the chamber. Obviously rusty chambers would be another issue" The chamber has maybe seen a bore brush 3-4 times in 30,000 plus. The good shells work fine, the off brands often get sticky. Have an 870 that hasn't seen a bore brush in decades. They usually will work in O/U and SxS, but have issues in autos and pumps. Off brand cases also may have a rim issue. The steel headed shells often do have a tendency to not return to their original diameter after expanding on firing. "Try some good shells-Winchester AA, Remington and Federal that are not the promo offerings. I use a 10ga bore brush spun with an electric drill to melt residue from chambers and a 12ga brush in choke tubes" "I'm suspecting plastic buildup in the chamber. If I begin to have problems I will change my tune. My guns have cycles Suprema and Cheddite without problems so I am not adverse to shooting them currently. hulls do not lend themselves well to reloading using the components I keep on hand. The top end lines of any of the manufacturers will be fine but at the lower end I would stick with Rem of all lines, all Federal/Estate lines, Winchester AA, and any import other than S&B. Some of the newer Federal lines are using Cheddita hulls which may be a cause of the recent complaints. Some Euro hulls are problematic, Sellier&Bellot have a reputation as does Suprema and occasionally Cheddite. They have reloaded and worked fine in the three shotguns so far. I have seen some Remington Gun Club type hulls with zinc covered heads but have not tried them new. I have not seen any problems with Remington and Federal hulls in the past though both companies have recently changed some of their shotshell lines. And don't let a brass or silverfish head fool you, that is merely a wash covering the steel and not an indication of what the base material is. As mentioned, it is due to the steel head on the hull as steel does not shrink as much as brass. This was not in all guns but in enough that I won't buy these shells even though the gun I was using at the time cycled them fine. Semi-autos and break actions required a cleaning rod or long dowel and a hammer to eject the hull. "Mortaring" the stock on the ground was the only way to open pump actions and I've seen two stocks broken this way. I have seen these lock up more than one shotgun and they can be a bear to get out. Universal, Super Speed, Super Target and other such names have been used. The Winchester cheapie scare the worst by far.