I love the corelokts and have killed a many a deer with them out of my 270. I shot a 195lb 8pt at 323yds and got a pass through a few years back. I have retrieved the bullets out of several deer that I've shot. If I'm able to retrieve them that means they did their job.Most of my non pass throughs have been quartering to me shots where I was shooting mostly the length of the deer and almost all of them I shot like that dropped in their tracks. I'm definitly a believer in them.