So I just bought one of the new 940 Pro Turkey guns, with the 18.5" barrel.  From everything I'm reading, the #9 TSS loads seem to do really well with an open choke such as a .675.  But I can't seem to find a .675 anywhere that fits this gun.  Does anyone have any recommendations?  This gun has the same thread pattern as the Mossberg 500, Browning Invector, and Win-choke.  It does not fit the Mossberg accumag choke thread pattern of the 835 and 935.