Well if you're just wanting plinking ammo, and cheap, you have to buy components in bulk: primers no less than 10,000, bullets same, powder multiples of 8 pound kegs. Here's my last calculated cost:
Brass 5 loadings out of 1X fired milsurp .02 per load
Bullets 147 gr pulldown (several sources) .09 ea
Primers Wolf (Powder Valley) .015 ea
Powder WC844 (8 lb from Pats) .06 ea
That makes each round cost .185, not too bad for plinking ammo.
These prices are still current if you take the time to do a little shopping, and you can even cut the cost some places. For example, Pat's still has .308 tracer bullets for .05 each which don't lite, good for plinking in an area where you won't start a fire, like a sand pit. And if you're lucky you can pick up some brass from a range for free. You have to put in the time to shop for cheap components, and I don't mean places like Cabelas or Midway. Think surplus dealers and buy quantity.