When I kept a pump it was my Mossy 500 20" with rifle sights, rear app removed to make a fast ghost ring. I kept the chamber empty with 4 of 000 followed by 4 slugs. I sold it off because of an arm disability.
I have a mongrel SXS 16G hammer gun, 18 1/2". Chambers loaded, 6 on a butt sleeve but really backed up by 3 M66s.

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NRA LIFE
Reserve Officer 9yrs