Thank you tracker366, for the link. Yes, I believe my website is the only place around where you can INTERACTIVELY compare cartridges visually. (And through this weekend - until Monday - as well as a few days each month - access to the tool is free to registered members).
You can line up any 8 rounds you wish (from the over 700 available) with either a metric or SAE ruler in the background (or even no ruler at all). There's a link to compare the displayed rounds ballistically with a single click. You can save "visual sets" either privately or to share with other AmmoGuide subscribers. Clicking on the cartridge label brings up detailed info for the riound, including case diagram...
With a single click, you can compare the ballistics for the displayed rounds:
to see the above rounds compared ballistically
More example graphics (actual onscreen size)...
(Click on this image to go to the AmmoGuide .223 detailed info page)