RE: 308 Win
I don't "roll my own", so I lean towards the premium carts.
I'm especially pleased and highly recommend the Winchester Supreme's. They make a .308 in 168gr called "Winchester Supreme® Ballistic Silvertip® Rifle Ammunition".
Kind of spendy, not for plinkin'. But very good for hunting. I'll get a box of lesser expensive ammo that closely resembles my hunting ammo, and plink with it. (Shoot more . . . shoot more often!!) Then just before hunting season(s), I'll put a couple primos through paper just to make sure where they are shooting. If you think about it, at that rate, a $32.00 box of ammo can last for years!