I've been shooting along side big game hunters at ranges of various sorts here in Kalifornia since 1958. Saw the coming of the .308 and it's family, and of the 7mm - .300 Magnums.
When the .25-06 arrived, it took off. I suspect it is far more popular than many thought it would be.
Most of the early rifles were built with magnum contour heavier barrels. I suspect that made for better shooting. The lack of magnum class recoil also helped I'm sure. The fact that it shot very flat to ranges where most couldn't hit anything helped as well.
I've never owned one, but I have owned and hunted the .240 Wby and the wildcat .25-284. Both killed surprisingly well with Nosler Partition or TTSX bullets.
The funny thing is that even guys that hunt in heavy cover use them. Never heard anyone complain about it. E
