If this were tru then that would put you at roughly 350 - 400 yards with a standard 270 without looking at a ballistics chart. I would venture to say you could make a kill shot at 500 - 600 yards hovever becuase I believe you only need 1,500 fps and roughly 1200 foot pounds of energy with a well placed shot.

Personally, even with my 7 Mag, I would not take a shot past 700 yards even if it were the buck of a lifetime. Of course that would be about 45inches high over the back using a bdc reticle and on a perfectly calm day.

I would also add that being with a more powerful scope, something like a 4 -12 x 50. You might also need a second shot to follow.