for years I have used buckshot in my Mossberg 12ga with a extra full or full choke in and my barrel doesn't have not one mark in it and my choke is in great shape. no problems. I also have a xxfull turkey choke from carlsons that I was using during turkey season with the turkey shells and then I left it in and bought some new buckshot ammo to try out and used it while that new choke was in it and it patterned good and caused no problems. But basically now I use the Mossberg choke tubes for the buckshot and the carlsons turkey choke tube for the turkey shot. I will be getting a new carlsons buckshot choke to replace the original Mossberg ones. They are great choke tubes.