Mj,

I know Big Stick will agree with me on this grin, but of the 2 choices you're considering, go with the 240. It's simply a cooler cartridge and not everyone owns one. Sure, factory ammo choices are more plentiful for the 25-06, but Weatherby offers a handful of choices as well. Killing Texas Whitetails isn't exactly difficult, and certainly doesn't require a fancy bullet and a speedy twist rate to do so. Heck, even Weatherby's economy minded 100 gr Norma Spitzer factory load will whack the shiat out of a Whitetail beyond distances most people are comfortable....or even capable of shooting. The beauty of the 240 is that when handloaded, you can send 55's out the pipe at 4000 fps or a slick 105 at 3300, which will easily cover anything in Texas. In the end though, you won't be able to discern much difference in performance between the 2 cartridges.