Remington says #1 or smaller in older pre rem choke 870 or 1100's I like my A-5 Belgians to much to ever run any size steel in them and only run it in my Jap A-5 Sweet when I have to. A friend of mine did seminars with roster for awhile and used big steel BB in his Ithaca o/u it ring bulged his bottom barrel ruining the gun you all can do whatever you like they are your guns. I might add that the full choke in a m12 duck is around .694" in constriction both mine were. They shoot 7/8 and 1 oz trap loads great but for today's ammo are really over choked. MB
