I do as well, if youre considering a 308, look heavily at 6.5 grendel, its a better performing round and a tad cheaper to build as it uses 90% standard AR parts. Plus, the cases tend to last quite a while with little to no trimming, I might have to trim 1 or 2 out of a batch, but normally I can go 2-3 reloading cycles before trimming. Cases tend to stay in shape. As for brass, I used dedicated 6.5 grendel brass but you can for plinking use necked down 7.62x 39 brass and just trim the necks a little, they work just fine.
