Ammunition - WWB .45ACP

The "Winchester White Box" (WWB) commonly purchased at Walmart has been on and off the approved ammo list. (It still appears in the posted Operators Manual PDF.) The advice I was given was "be careful" with it. In early January 2010, of the 2000 (or so) Vectors shipped out 12 of them have been sent back to KRISS USA for a squib round in the barrel. Of the 12, 10 of them were WWB.