Greybeards has a forum dedicated to them and I think the the shell getting stuck is an issue with the .243 for some reason. I seems to be the caliber that you hear most of the problems with this happening.

I own a H&R Ultra Slug gun and couldn't be happier with it. Great gun for the money. I would not hesitate to get a centerfire version.

Another plus is you can have other barrels fitted to them so you can use more than one caliber or use a shotgun barrel all with the same reciever. Much like the encores, except the barrel has to be fitted.

Paul