I've got a Remington 11-87 and so far it's digested all the ammo I put through it. Last Sunday I tried a box of Winchester Heavy Target loads and it looks as though they're not cycling. I had to take the barrel off to get them out when they did. Is this an issue with the ammunition? The O-ring seems to be in perfect shape. I've also put probably put 2k or more Estate branded rounds through it with no problems.