Reddit reviews Cartridges of the World: A Complete and Illustrated Reference for Over 1500 Cartridges
We found 2 Reddit comments about Cartridges of the World: A Complete and Illustrated Reference for Over 1500 Cartridges. Here are the top ones, ranked by their Reddit score.
shotgun shellsrifle shelscartridgescommerical ammunitionwildcats
I hate to say it, but Wikipedia is a decent source for information on calibers. For example:
http://en.wikipedia.org/wiki/7.62_mm_caliber
http://en.wikipedia.org/wiki/7.62x39mm
http://en.wikipedia.org/wiki/.30-06_Springfield
A good book or two would be a wise purchase however:
http://www.amazon.com/Cartridges-World-Complete-Illustrated-Reference/dp/0896899365/ref=pd_sim_b_1
Only round that book is likely missing is the 300AAC Blackout, a new .30 round designed to be fired from a 5.56mm AR with only a change in the barrel.
EDIT: Supposedly the 12th edition of Cartridges of the World isn't as good as the 11th:
http://www.amazon.com/Cartridges-World-11th-Frank-Barnes/dp/0896892972/ref=sr_1_2?s=books&ie=UTF8&qid=1324274889&sr=1-2
Cartridges of the World is a great resource.