This got me thinking. After years of hoping to run into the perfect 6mm Remington, I finally succumbed to a .243, a 60s Sako Forester about 10 years ago. Gave that one away, and four others have since stayed here for a while, all purchased new. None of them has ever seen a single factory round, except probably the Sako in its former life. The new one seems like the most accurate of the bunch, and with all the components acquired for the others on hand, it'll never run dry.
Based solely on comments read here over the years, if forced into using factory stuff, I'd probably start with Fed blue box, which seems to be pretty popular, and cheap.
