Your barrel will only last 6 seconds! Here's a very interesting article:
http://bulletin.accurateshooter.com/...s-barrel-life/
I've read that powder type can effect barrel life. You will get some erosion from the powder granules but also the flame temperature of the powder will cause some difference. Overheating of the barrel shooting fast will make a difference. But most of the info you'll find will say that improper cleaning of the barrel will cause more wear and ruin more barrels than anything else. Experts say to use a proper fitting bore guide for your cleaning rod, a coated one piece rod, and cleaning from the chamber end if possible. And as mentioned some calibers just burn out barrels faster than others.