I have a mix of both Win & Hornady brass from factory loads I first shot through my 250 during break-in, but more recently I've been using Nosler Custom Brass that I got at Cabela's. I've tried Nosler in 22-250rem, 243win, and 17rem now and I've really been impressed with this brass! (I went heavy on Lapua though for my 243 & 3 30-06's, no complaints.) My only experience buying Win brass was a bad one, with my 243.