I've hunted with a 7mm mag for 20 years and have never lost a deer. Ive killed countless deer with good and bad shots. I can't recall a time that one traveled 20+ yards. Most kills have been DRT or "quivering death flop". I've shot the same Browning BAR and have always shot 150 gr Remington Core Lokt.
I have semi-retired that gun this year and now shooting an A-Bolt, and picked up several boxes of different types of ammo in a trade. I'm anxious to see the kill results out of these different types of ammo.