About 15 years ago I acquired a customized Rem 700 in 6x284 with dies a about 250 virgin Winchester brand brass. As I formed brass I also formed 10 each from 6.5x284 Norma & Lapua Brass. As load development progresses, I wanted to know which brass performed the best. I loaded 10 of each brass with the same tray of primers, box of bullets and can of powder. In the same est of dies, I couldn't make these 30 rounds of ammo any more identical!
Test results: At 100 yards the Norma Brass shot a 3/8" group, the Lapua Brass shot a 3/8" group, and the Winchester Brass shot a 1 1/8" group!
I ended giving the Winchester brass to a Friend with a Model 88, and ordered mor Lapua Brass! The first Match I shot it in was a "One Shot" shoot at an unknown distance. I set my trajectory for 500 yards (I knew the range couldn't be much longer). The first target was a 2 liter bottle of orange soda. I could feel a slight breeze on my right cheek, so I placed the crosshair on the right edge of the bottle half way up, and fired. HIT! Half way up and 1" off the right edge. Second Target was a 16 ounce bottle of Coke, Aimed dead center. HIT. I was the only person to hit the second target. I won the pot. $53 winnings.
Turns out after the shoot I laser ranged the target: 527 yards. There was a nearby poster, I fired a 5 shot group on it, slightly less than an inch. (less than .2 MOA)
A two time national champion rifle shooter (and member of the original Army Marksmanship Unit.) told me something I always consider: You CANNOT have good ammunition without good brass!
The guy that had the gun build was into Extreme Velocity and had it built with a slow twist barrel, 1:12. I'm into Extreme Distance and would have gone with 1:7. But there is no denying it is a good gun. I used IMR 4831SC, Federal 210M primer, and Sierra Blitzking 70 grain bullet, a varmint bullet not a Match bullet. It performed better than Hornady, Nosler or Berger bullets in the same weight range.
Ivan
BTW, the scope I use on this gun Is an old Burris 8x32 target scope with more adjustment than an aircraft carrier and about 2 feet long! Single fine crosshair.