I came across this today on another forum and found it worth reading. I benefited from it, and think some here might find it useful. I did a quick search to check if it was already posted here, but nothing came up. If it is a dupe or old news, just pass on by; perhaps others will find it useful.
http://www.luckygunner.com/labs/revolver-ballistics-test/
http://www.luckygunner.com/labs/revolver-ballistics-test/