Think of it this way , your gun has an 18" barrel and your follower in the magazine is about 5/8" thick [for the factory version] , when you compress the spring fully the follower will stop at the small diameter shoulder at the end of the tube , roughly 1/4" short from the end of the muzzle . 18" barrel - 5/8" follower - 1/4" shoulder = 17 1/8" , 17 1/8" divided by 2 3/4" shell = 6.23 shells in the tube . I would swap out the stock follower with a Scattergun Technoligies follower , this would keep you from jamming the spring by trying to force in an extra shell . The Marine Magnums are great guns , I love mine . Good luck , Mike...
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