For several reasons this is not a real good idea. First, what if you need a seriously lethal round right off the bat? You may have time to switch them out, or to fire two rounds, or you may not...feel lucky? Second, the "less lethal" does not absolve you of the fact that you will be using lethal force, since the gun, even so-loaded, can certainly still kill, thus you must exercise the same standard of care that you would if the first round were, say, #00Buck. Third, if you hear a noise in the middle of the night, decide to investigate, and leave the gun with your GF, or wife (please not with both at the same time
) are you going to leave her with the less lethal round chambered or in the mag?...or are you going to take the time...under stress and in the dark, etc...to switch rounds...or just jack the first through the action and then out and chamber another...making lots of noise??? Or exactly what?
For me, my shotguns are "No-BS" guns, and if I go for one, things have gotten damned serious and someone is probably about to get hurt really...really!...bad!
JMO