I really like Barnes bullets in a couple of my guns. But their claim of zero weight loss is more than an exageration. Over the years I've recovered about 15 of them and I've seen weight loss in every one.
A couple had all four petals broken off, and some just lost pieces. I just pulled the three I still haveout of my reloading bench and weighed them. Average weight retention on the three is 88%. None of these had petals missing. Still damn good though.