Fantastic!
I've been using a R77 in .257 since '86 for coyotes on up. It's still one of my favorites. I dumped a truckload of coyotes with the 75gr Hornady HP. I believe using IMR 4064 if I remember correctly. I've used 100's up to 120's. All were accurate enough for hunting, not a single load I've tried was impressive from the bench.