At 25 feet or less (sorry, about 3 meters?) it really doesn't matter what shot size one uses in the 12 gauge. For in-home use I would advise #6 birdshot. Across a room it will tear a man in half but won't go sailing through walls, too badly. Outside, where distances may open up to say, 25 yards (um... 20 meters?) buckshot of #00 to #4 persaution works fine. Longer than this and you need a rifle. I would pass on slugs unless limited to the shotgun. If I am firing a single projectile the shotgun isn't my first choice.
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