I shot a couple of boxes of them out of my 336A, they were accurate enough for coyote hunting but like IDshooter said the sights were so far off it was difficult to make shots.You know, back in the day, I tried them in both 30-06 and 30-30. Once I used a big enough target backing to see the group, I found they didn't shoot terrible, just not good enough for varmints. In my 30-30 they were about as accurate as regular ammo. The real problem was that the sights simply couldn't be adjusted enough on either rifle to get them zeroed.
I think the died because they were just useless. No conspiracy necessary.