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It seems a lot of people mix up the information on different cartridges. This is one of those times when the information is just wrong, and potentially very dangerous. The 7.62x39 and .308...
If this is something you’re asking, you’re about to save money and open up your ammo selection. A shotgun with a 3-inch chamber will work flawlessly with both 3-inch and 2 ¾-inch shotshells....