Based on some research I did to find the 'ideal' calibers for plains game as well as dangerous game, I did some analysis around the 'effective' power of various calibers. Based on the assumption that lower recoil = more practice = better accuracy, I wanted to find the combination of caliber / weight that offered the 'sweet spot' in terms of killing power per foot-lb of recoil. Then I added in a 'cost effectiveness' factor for the best combination of killing power per dollar to factor in ammunition costs. To standardize "killing power" I used the Taylor KO score as it's easy to calculate, and then divided it by 100 so it would graph with the other values - they use the undivided score, for those of you who care about such things. The graph is sorted by bullet diameter. I thought some of you might enjoy this, so I decided to share it with you folks. A few findings from my research: Best "Killing power per ft/lb of recoil" calibers: 404 Jeffries 9.3x62 458 Win Mag 375 H&H 416 Rem Best "Killing power per dollar" calibers: 338 Win Mag 375 H&H 458 Win Mag 404 Jeffries 30.06 Springfield The full data (and complete graph with mouseover values) is available here, as embedding the graph hides some of the legends: Google Spreadsheet Link Enjoy! Disclaimers: This is from an American perspective so I picked calibers that are readily available here; sorry if I left out your favorite. Prices are based on Internet pricing I found as of today (but are subject to change). Data is collected from publically available sources around the Internet including Chuckhawks.com and Wikipedia.