I have now seen two deer and an antelope killed with ballistic tips, here are the results.
Antelope@250yrds 6.5x55 Swedish 120 BT=Legs buckled and buck dropped where it stood, Bullet hit bone and didn't exit, but pentrated all the way to the other side after hitting the close shoulder blade.
Wyoming Mulie@150 308 165BT=Legs buckled and deer dropped instantly, double lung hit, exit hole was twice the size of entrance
Coues whitetail@270 yrds 300WSM 150 BT= Deer ran 20 yrds and folded, he hit him kind of high and far back. Entrance and exit wounds were about the same size. Not much expansion at that distance on such a small animal.
I don't have a ton of different experience, but from what I have seen, BTs are deadly on big game.
Any yes, they do make a ballistic tip varmint bullet, but it specifies varmint the box and is not to be used for big game. Both the big game style and varmint styles are extremely accurate, which is why I like them and other similiar style bullets. Given the choice though, I will now use accubonds, since they have even less risk of coming apart, even though that has not been a problem with the Ballistic tips.
Good hunting,
Brian