Handloading is the only real way you can control the quality of all components used! Still no guarantee but I use only CCI primers and I am certain that the proper amount of a good quality powder is there. Not much else you can do!
There is a lot of crappy factory ammo out there. A name like Remington and you cant even trust them with your life. A few different instructors told me that they have been seeing some real shit ammo too. For me...I'll continue to make my own. I know it works. ALL of them.