The thing with Nosler ballistic tips is that they vary greatly by caliber and bullet weight.Nosler has modified specific ballistic tips considerably to make them tougher,yet left others quite soft.I have had great luck with the 140gr -.284" ballistic tip,yet a friend had terrible luck with the 130 gr .277" ballistic tip over expanding and coming apart at high velocity.The recent version of the 180gr-.308" ballistic tip is very tough,while earlier versions were quite soft.I have recovered very few 140gr-7mm ballistic tips,but those that I did recover retained about 40% of their original weight.These were bullets that struck both front shoulders by accident,and shattered them.They lost over half their weight,but even when striking solid bone at very high velocity,they certainly did not explode like a varmint bullet.I have also recoved a few 140gr-7mm partitions with similar shot placement,and they only retained about 60% of their original weight.The best bullet that I have found for retaining weight when striking bone at high velocity is the barnes tsx which usually retains about 90% of it's original weight.