You know, I thought about this more, and in retrospect I'm 99.9% sure I've had issues with the 147s coming apart in the recently. That said, I'm leaning towards it being specific lots of bullets having the problem.
About 6-8 months ago I purchased 1,000 of them from Midway, and lucky me, I got 10 individual 100rd boxes, comprised of about 8 unique lots. Much to my surprise they measure/weigh very consistently, and shoot way better than a 30-cent bullet should. On one lot however, I had some major issues.
Went shooting with my dad (this is memorable, because it's probably the 2nd-3rd time it's happened in my life) and wanted to introduce him to LR shooting. We set a 12" gong up at 400 yards on a hot, no-wind day (an absolute cake walk of a shot right?). The only thing different about this day was I was fire forming new brass, and had loaded yet another new lot of those 147s.
999 times out of 1000 I'd expect to first round hit (or at the very least 2nd round hit) a plate at that distance. I shot 22 rounds (holding different edges of the plate etc.)and didn't hit it once. In fact, I couldn't spot impacts on a dirt backstop on the shots. At the time it was somewhat embarrassing, but more than that it was frustrating as hell because I couldn't explain what was happening. I ended up pulling the bullets and dumped them in a coffee can somewhere.
In retrospect, my father wouldn't have known what to look for, and there's a minuscule chance you're seeing a blow up from behind the rifle.
I've since shot the 147s (a different lot than mentioned above), and they shot very well; out of the same barrel only with a higher round count for that matter. In fact, a crappy 'sharpshooter' rated LR shooter like me had such good luck with them this past weekend, I ordered 2,000 of them (and 1k 140 Hybrids, thank god) on the drive back home from Houston.
This thread, and the realization above makes me nervous as hell about that purchase.