Do they all jam, or is it just me? My son's Winchester SX3 kept jamming at the sporting clays range the other day. It's not the first time. He's good about cleaning it and the gun is about a year old. He also has a Beretta 391 youth 20 ga that jams something fierce. Clean it, shoot a half box and it won't kick shells after that. My wife's 1100 LT 20 also occasionally jams after a box or so. Do I just not know how to clean a semi-auto, or is this typical of all auto loaders? Any tips would be appreciated.