The ONLY WAY to have any control over ammo is to load it yourself. The factory is not shooting the ammo you buy - only selling it. And the QC I have seen with factory ammo over the last ten years is terrible. I have seen boxes of factory loads from Winchester with primers loaded upside down, smashed into the primer pocket sideways and cases with no flash hole in them. If they will do that do you really think they are carefully controlling or checking the powder charges? I have yet to see one single ammo manufacturer that will even guarantee that the rounds they sell you will even fire.