Nosler BTs suck, they are going to fragment out of the 270 and 270WSM as you have witnessed. Go back to your Sierra's or give the Nosler Partition a try.The Partitionis one of the best, if not the best,Hunting bullet available today. Or if you like the accuracy of the Nosler BT, switch over to the Nosler Accubond. Same great accuracy as the BT without the explosive fragmentation.