The are bullets that are designed for varmints and there are bullets designed for deer. While it don't hurt much using deer bullets on varmints, the opposite ain't at all true. I'm not familiar with any 80 grain bullet designed for deer, there may be some but I don't know about them. The 85 grain Sierra Game King and the Hornady 87-grian Inter lock are the lightest game bullets I've seen actually used. I once killed a nice antelope at 325 long paces with the Hornady, but there was some up and down in that so I don't know the distance the bullet traveled. My Dad might have had a failure with the Sierra, but my brother just thinks he missed. Who can tell what 80 somethings are seeing?