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I do have neighbors and I dont think they would want 00.00 buck pellets flying through their house. Also, I have multiple family members around the house. If you are going to use a shotgun indoors and neighbors are a concern, lighter loads are still devastating at "inside the house" ranges. If I had to choose between a shotgun and an AR I would choose an AR with 55 grain hollow points that will fragment appart as they go through walls
Bruce.
The "Box 'o Truth" pretty much exposes a lot of the conventional wisdom about 5.56mm being used indoors as old wives tales. It doesn't matter if it is ball, or soft points, or JHPs, anything worth shooting at a human out of a 5.56mm rifle is going to penetrate multiple layers of drywall.
http://www.theboxotruth.com/index.htm
Even frangible, the stuff not intended for SD, penetrates drywall. Worse yet, 5.56 presents a bit of a huge problem for the self-defender.
Unlike common handgun rounds, 5.56 has a disturbing tendency to deviate from its aim point after striking drywall, to the point of total unpredictability as to the flight path.
In my mind, this causes 5.56 to violate one of the four basic rules for the shooter.
"Know your target and what lay beyond it."
A pistol round will carve a fairly straight path through drywall and will burrow into studs. Therefore, you can have a reasonable certainty of what might lay beyond its flight path. A miss with 5.56 means all bets are off as the round goes on penetrating far enough and fast enough in an unknown direction with a enough momentum to kill or maim an unintended target.
A shotgun will fire a tight initial group at room distances and the pellets will penetrate drywall as well, but the pellets take a predictable course and spread and as demonstrated at the Box, will penetrate fewer sheets of drywall than service caliber pistol rounds.
5.56 "breaking up" off of drywall is an internet exaggeration. It will eventually do so, but not fast enough to save you from a bad outcome in the next room or two if you hit a loved one unintentionally. Anything that can penetrate a bad guy adequately is going to also put the hurt on walls in the event of a miss.