68 Hornady's go on sale a lot as do the 75BTHPs. You can't go wrong with Varget. Or AR Comp, or H4895 or 8208 or.... several others.
I buy whatever SR primer is cheapest except for 400s, WSRs or 6 1/2s. They all work well with one load or another, but I prefer magnums. I've been shooting the heck out of Wolf right now. They come so cheap already loaded into virgin brass it's hard to pass up. They win matches too.
