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.410 bore, commonly misnamed the .410 gauge, is the smallest gauge of shotgun shell commonly available. It has similar base dimensions to the .45 Colt revolver cartridge, though the .410 is significantly longer, up to 3 inches (76 mm), allowing many single-shot firearms and some revolvers chambered in that caliber to fire shot without any modifications.
http://en.wikipedia.org/wiki/File:Shotshell_001.jpg
Please don't lie
The 410 is way bigger than the puny 20 gauge.
Get ur facts straight.
.410 bore, commonly misnamed the .410 gauge, is the smallest gauge of shotgun shell commonly available. It has similar base dimensions to the .45 Colt revolver cartridge, though the .410 is significantly longer, up to 3 inches (76 mm), allowing many single-shot firearms and some revolvers chambered in that caliber to fire shot without any modifications.
http://en.wikipedia.org/wiki/File:Shotshell_001.jpg