Big Tom-
Yes, I am shooting a .270 with the core-lokts, and I have never failed to get good exit holes, about nickel-sized, in medium-sized whitetails 100-200 lbs. with both 130 gr and 150 gr. bullets. I NEVER get knockdowns, but I always get good blood trails and sure kills. I have used Federal soft points and gotten mostly knock-downs but seldom an exit hole or blood trail. It is a trade-off; when you expect your bullet to penetrate all the way through, then you can't expect as much knockdown energy, and vice-versa. I like the exit hole and blood trail option, since in my experience you can't always count on a knockdown 100% of the time.