In his book, Kyle spoke of the round, saying, “I used the .300 Win Mag for most of my kills. It’s an excellent all-around cartridge, whose performance allows for superb accuracy as well as stopping power. It shoots like a laser. Anything from 1,000 yards and out, you’re just plain nailing it.”
The man's own words...
The 25-06 is not "better" than the 6.5 Creedmoor. The heaviest factory ammo available for the 25-06 is a 120 bullet which will drift more in the wind than the 147 grain 6.5 Creedmoor bullets. There are things the 25-06 does well, but to say it is better than the 6.5 is really a matter of application. Within 200 yards or so, yes, the 25-06 does some things better than the 6.5. With heavier bullets at longer ranges, the 6.5 leaves the 25-06 behind.