OK, here's the less than lethal approach to keeping bad guys @ bay by teaching them a cheap lesson in fright.
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I bought a box of these a couple of years ago from a friend that came across them. The first 2 rounds of ammo in my Winchester 1300 are Fiocchi Rubber Buckshot rounds, the next 4 rounds are lead buckshot.
if you're gonna do something like I've done then make sure you've got the shells in the right order so that you're shooting the rubber FIRST! (Thnx Bobby).
if you're the excitable nervous type then place a spent shell between the rubber & lead shells, even if you've forgotten how many rubber shots you've fired you can't get to lead w/out coming to the dead shell first as a reminder, the one drawback of course being the 1 or 2 wasted seconds cycling a dead shell out if you're really in a hurry for a live one. But being real, that won't be happening to 99.99% of us.
Load a spent shell ? That's the dumbest thing I've heard in awhile. Fuck that less than lethal shit also. Both are good ways to get yourself killed. If you need to pull out a gun for defense you should be prepared to use it.