Elkampmaster, The energy levels I stated are impact levels that I would want to have. If I have selected my bullet and powder wisely or factory load I would shoot the 7x7 through the lungs. I believe the energy and velocity levels for the 7x57 and other rounds in its class .308, 7m-08,.270,.280,30-06,.284win,.358win,.35 whelen etc. should have what it takes to take down any elk, out to 250-300 yards maximum. This is just my opinion. These rounds are all easy on recoil, most have numerous good factory loads and except for the .284 plenty of cheap brass for reloaders. This all adds up to shooters being able to practice with their rifles more, which means more hits. In my opinion when the range increases past 300 yds you should look at the 7mm mags to the .340 mag anymore gun is not neaded in North America. Though I have shot some .375 H&H loads that were easiser to hit with than a .338.