FWIW, I use a 270win the most. Most of my tags are filled with shots between 250 and 350. A few have been over 400, and I prefer to keep them under 500. My I took a mule deer buck a 435 a couple years back with my "short action" 270 (aka 7mm-08). My bro-in-law took a large core elk this year at 569 with a well placed 150 being pushed by a 270win. In short, you have enough gun for 400 (and more under the right conditions). Go shoot more. Enjoy.