Some people worry a lot.
Ulcer candidates.
As far as the Gamekings: During a discussion here at TFL some years back, a Sierra rep joined in. I had a .30 150-grain SPBT blow up in a deer's neck. I'm getting around 3,000 ft/sec from the load. It was a 30-yard shot.
The Sierra guy said it would not have happened with the flat based 150. The jacket is a tad thicker. The BTs work best with an MV of around 2,800, or impact velocities below 2,700 or so. Well, that makes sense to me, since I've never had an blowup out at 100 or 200 yards with the BT bullet on a dozen or so deer.
So, Taylorce, I'd guess your correspondent's blowup was via the use of a BT bullet driven faster than the design was meant for.
, Art