As stated above, it is the Sierra 165 GK-HPBT. One of the largest Whitetails I ever killed was shot with one of these. Between it and the 165 GK- SPBT, scores of deer and other game have filled my freezers. I think I still have a box or two of those in the shop.
.363 bc with that big open tip. Not good at all but yes they killed good. Used up a bunch of these in the 80s. I didn't even know what bc was when I started. I told them get me a good bullet for my 06 and this is what the guy handed me.