What kind of barrel life do the different calibers usually get out good quality barrels? I know there are a lot of factors that contribute to barrel life but in general which ones burn up a barrel quick and which ones will go for more rounds? If you can give me some ballpark figures I would certainly appreciate it. Reason for asking, see "Help me build all around". http://www.websitetoolbox.com/tool/post/6mmbr/vpost?id=3182694