The thread "Bullet Mass vs. Velocity" (http://www.northwestfirearms.com/general-firearm-discussion/86048-bullet-mass-vs-velocity.html) reminded me of a similar question I have pondered for a long time. It concerns bullet mass and speed. How do you (you, yourself, not the manufacture's advertising) determine which cartridge will have the greatest terminal energy at a given distance. Impact energy is determined by mass and speed at impact. I don't want to get into penetration and bullet shape and all that. I just want to know how to determine which will have the greatest impact energy. There should be some sort of simple formula. For an example, A 230 grain bullet traveling at 750 ft. per second equals X (some number). A 115 grain bullet traveling at 1000 ft. per second = Y. What is the impact energy in say pounds for the different bullets and speeds? :huh: Thanks, Ed Oh - And how do you get the new spell checker to work??? Clicking on it does nothing (for me).