Supposedly LaRue seems to have the most accounts of amazing performance and reliability. I think a few people here have one. It's quite a wait to get one though, I hear. Ammo will just depend on that particular rifle. You'll need to test the usual suspects if you're planning on shooting factory loads, like Federal 168BTHP, 175SMK, Nosler, Hornady, and for extended ranges even check out Litz's ABM www.BuyABMAmmo.com