I had that problem myself with my SBE II. In fact, it's not a problem unless your gun realy needs repairs. You probably used the wrong cartridges just like I did once and then the gun don't cycle. Has I said in another thread, if you want your SBE II to cycle, you need to use 2 3/4 cartridges with high velocity, 1500 feet/second minimum for that little shell.
Obviously, when you use heavy loads such as the Remington Magnum Turkey cartridges, you don't need 1500 f/s velocity because the load is heavy enough. Your SBE has the Inertia system. It uses the recoil to eject the cartridge you just fired. It needs a hard recoil to cycle. If the recoil is not hard enough, the Inertia system don't work, the second cartridge won't move in your gun and the shell you just fired is jammed in.
I live in London in the UK. When I shoot 2 3/4 cartridges, I always use the Lyalvale Express World Cup 28 gms, 1500 f/s to shoot clays in a club. This is the one you need. I am sure you could find a simillar shell in the US in the Remington, Federal or Winchster. Always remember, when you want to shoot 2 3/4 cartridges, you need a minimum of 1500 f/s velocity, otherwise, it won't cycle. I am obviously talking ligh loads here. Of course if you shoot cartridges heavier than 1 1/8 oz, your gun will cycle.