I shoot 130 OTM Bergers out of my 260 R.E.M. I necked down lake city Match '76 308 brass. Thing shoots easy sub MOA out past 600 and I've not even done load development for it. Couldn't really care less about losing the brass. I bought 1000 for $160.
I do the same thing for brass, once fired 308 brass is cheap and easy to work with. Im shooting a 24in Bartlein 5c barrel with 140gr sierras, performs well out to 1000 from what ive done.