I jumped on the BT band wagon when they came out .Shooting them in my 7 mm's.Over the years that have gotten noticeably tougher.But I have since went back to the old reliable Hornady interbond or interloc which ever they still make.Don't know why I ever changed anyway.IMHO the Hornady is in every way a better projectile. Also this is from field conditions.I forgot " If it ain't broke don't fix it".