If you a looking at Whitetail deer as your main, or largest quarry, I’m with HeymSR20 above. The Hornady 139 will do everything you need it to do inexpensively. It’s not a sexy “premium” bullet it’s just accurate and effective. The 154 is it’s big brother, with a little more mass. Enjoy the 7x57 for what it is, and don’t try to “magnumize” your loads. The advertised benefits of the premium bullets aren’t realized with the modest velocities of the 7x57.