For those of you looking for cheap .308, Sportsmans guide has .308 battlepacks (south african) for around $0.14/ round (after shipping, but you have to use the online coupons that pop up when you pull the site up).  You'll have to put in the item #HX3A-78124; it doesn't come up under ammunition yet.  I just got some and it's really clean shooting stuff.  Now if they would just get that .223 in......