Re: .270 max whitetail deer range.
Just as far as you can hit it exactly where you wish. Bullet wise any thing as good as or better than the 130gr Sierra boat tail. Really! Have shot mule deer from front to back with that bullet that went end to end and worked perfectly.
I now us 140 Hornady interlocks for just a little more umph.
All in all I'd say the cartridge is a very good 800 or 850yd cartridge but because of trajectory much farther than that takes a bunch of practice but it has the the horsepower to do the job on deer.
I may be the slowest guy on the mountain . . . . but . . . . I'm on the mountain!