The .30/06 is perhaps my favorite cartridge, but in some cases, a .300 magnum is better. Typically, the .30/06 (180 @ 2750) is sighted 2" high at 100, and hits zero at 200, and is 8" low at 300. A .300 Winchester, sighted for 250 yards, prints 2" high at 100, just like the '06, but the bullet strikes only 3.5" low at 300, so if your self imposed maximum range is about 300 yards, this represents a useful advantage.
In terms of terminal performance, a faster bullet produces larger wound volumes, than a similarly constructed, slower bullet. A bullet that doesn't upset penetrates deeper, a bullet that is designed to grenade will do so more violently, and a bullet that is designed for controlled expansion on big game will meet its maximum expanded diameter sooner. John Nosler designed his Partition bullet because he was dissatisfied with the existing bullet performance on elk with his .300 Weatherby. A bullet that hits faster and harder, must be constructed more strongly, but must also take the target density into consideration. If you're deer hunting with a .30/06, a 150 gr Ballistic Tip will produce lightning fast kills. It you are deer hunting with a .300 magnum, the Ballistic Tip will act more like a varmint bullet, so the Accubond is a better choice, but the Accubond from an '06 probably won't kill as quickly as the Ballistic Tip, due to the lower velocity, and light target density.