The 25-06 is just your standard 30-06 case necked down to .25 caliber. From a 24" barrel, it can drive an 85 grain bullet to around 3500 fps, a 100 grain bullet to 3300 fps and a 117-120 in the neighborhood of 3000 fps.
It really comes into its own with the heavier bullets, in my opinion. As a deer cartridge, with a 117-120 grain bullet, it's a fantastic performer out to ranges farther than most folks should be shooting.