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Andre, it has a 3 inch chamber and can use 3 inch or 2 3/4 inch shells. Cheers and stay safe!

With a pump action shotgun their not too picky about running specific types or velocity of ammo, because you cycle the action manually, the king 12 should eat whatever you feed it, as long as its 2¾" or 3" shells. Good affordable practice ammo here https://www.budsgunshop.com/product_info.php/products_id/411560041 ----------- And here https://www.budsgunshop.com/product_info.php/products_id/712011400 ------------- Then use some 00 buckshot for home defense good options here https://www.budsgunshop.com/product_info.php/products_id/65079 ------------------ And here https://www.budsgunshop.com/product_info.php/products_id/411559291 ---------------- Or some low recoil buckshot here https://www.budsgunshop.com/product_info.php/products_id/411559293

What Paul said.