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"I policeman friend of mine suggested using a shotgun with 00 buck."

You get stopping power to spare with this, but now you have an over-penetration issue to deal with. Maybe a problem, maybe not, but something to consider. Just for yuks, you might take a couple of pieces of drywall to the range as a target holder. Put something behind it, and let rip with a single round of #6-7 birdshot. You'll see over-penetration through the second sheet of drywall, but pretty low energy in the pellets as well. (wet phone books are a good "poor man's ballistic gellatin" for this purpose). Then try the same thing with the 00. Still plenty of energy left in those pellets. Just something to consider. At home defense ranges, the birdshot will have gobs of goblin-stopping power without as much of those nasty after-effects should you miss. Still have to watch your background, though.

"in my house, I might not be as accurate as I'd like."

At home defense ranges (at least in my house, the longest shot I could even theoretically find is 20') you're dealing with, max, a 4" pattern. Still have to aim pretty good to avoid damage to non-combatants. Powerful tool, the shotgun, but it's not a panacea, and it's not as maneuverable in a hallway as a pistola. At my house, it would be my job to grab the pistol and go police up the kids and shove 'em into the safe room, while wifey stays behind cover and 'holds' the top of the stairway with the Mossberg. Gotta choose the right tool for the job, and teamwork is sooo important!