The most recent experience which comes to mind was during a CCW class we were teaching the other night ...
One of the licensees brought a new box of S&B .38 Spl ammunition to use during qualification. After several repeated failures-to-ignite occurred in his revolver, all of which involved some rather impressively well-struck, deeply indented primer cups, he switched to a different brand of ammunition and completed his qualification. He 'donated' the remaining unused box of it to us, obviously not wishing to keep it.