I agree with you on the shot placement in the spine, it works, it pissed a few of them off but one more shot finished them. the barns tsx did what you described, the petals came off. But graybeard, out of the 260 Rem belive it or not the 100 grain partitions work the best so far.
I have tried 120 and 140 the 120 works but the 140 stops to quick. I tried placement shots with different loads to se how they penatrated the hogs, and so far the best penatration has been the 100 grain partitions. We have never had hogs on our ranch, this year they showed up in herds. My best day of pig shooting was 11 hogs in 6 hours. I have a problem and need to make sure my bullets are truley doin the job of eratication, I grow cows not sows and do not care for streching fence all day