I shoot corrosive 5.45x39 ammo just because it is so cheap.
I have a few friends that use this cal. so we do a group buy on this ammo & get it for as low as 10.8 cents per round.
It takes a little more cleaning but for that price it is worth it, I buy in bulk at least one case at a time, that is 2160 rds per case.
Here is where I get mine, last time I bought two cases that was 10.8 cents per round + shipping.
http://www.usarmorycorps.com/index.php?page=shop.product_details&category_id=34 &flypage=flypage.tpl&product_id=65&option=com_virt uemart&Itemid=53&vmcchk=1&Itemid=53
If you want to stay with non-corrosive try going to Brown Bear or Silver Bear it is a lot better ammo, for about the same price.