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This has a 3 inch chamber so 2-3/4 inch and 3 inch shells will work in this This will also shoot scatter, buck or slugs. When using 2-3/4 inch shells I'd use standard to high velocity rounds to make the bolt completely cycles for reliability. Hope this helps.

Daniel, for self defense the following Buckshot and Slug loads are recommended : (inside of the Home): https://www.budsgunshop.com/product_info.php/products_id/411559297/rio+royal+buck+12+ga+2-34+#4-buck+27+pellet+5rd+box ------------------ (Outside of the home) : https://www.budsgunshop.com/product_info.php/products_id/713073446/nobelsport+12ga+275+00-buck+10rd+box (Outside the home farther distance) : https://www.budsgunshop.com/product_info.php/products_id/15600/federal+vital+shok+12+ga+2+34+1+oz+lead+rifle+slug+5rd+box

Daniel, you'll get best results using high velocity ammo rated 1300fps or higher. The SDS Bullpup has trouble cycling lower powered rounds. Video here >>> youtube.com/watch?v=yWubkcizxNA .....Have a great day!