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Larry, this has a 5+1 2.5" 410 Shell capacity.

It is a 3 inch chamber and capacity is 5+1 of 3 inch .410 shells Mossberg site 590 Shockwave – .410 Bore #50649 SPECIFICATIONS Capacity 6 Chamber 3" Barrel Type Heavy-Walled Barrel Length 14" Sight Bead Choke Cylinder-Bore Barrel Finish Matte Blued Stock Finish Raptor Grip / Corn Cob Forend w/ Strap Weight 4.24 Length 26.37" UPC 015813506496 Link to Mossberg spec sheet https://www.mossberg.com/product/590-shockwave-410-bore/