I own both a .270 WIN and a 7mm Rem Mag in a Remington 700 BDL...I also own a 270 WSM. Love both the 270 and 7mm (.284) and as other have mentioned, only .014 difference in bullet dia. Over the years I have had good luck with both rounds and have taken several deer, elk and pronghorn with both. That being said, I prefer the 270 (and really prefer the 270 WSM) over the 7mm for 3 reasons...1. 270 has more bullet options available, 2. the 270 has less recoil, 3. reloading non-belted ammo is easier.