If you perform a search for 338 lapua Hornady brass you will get links to several threads that talk about it in multiple sections. Sorry for the broad answer, but there were just too many threads to choose from. Just FYI, I have now shot PRVI Partisan ammo, HSM loaded with Starline Brass , and Double Tap loaded in Lapua Brass with Zero feeding or ejecting issues. (all factory loads)(no handloading YET)