I had a 6.5/284 Winchester wildcat in the late 90's. I necked down 284 Win brass. It was good, tough brass. That reamer was designed with a short throat. Again, I was told that when it became a SAAMI round, the reamer cut a longer throat ( for the long action/long range heavies 140+) I got some of the new made Lapua, Hornady & Norma brass and all were much softer than the Lot of Win brass I was using. Couldn't get quite the same speed, but still a good, flat shooter. I purposely had mine built on a Mod 700 SA and only used the 120/125gr bullets. I'm a "point shooter" and limit myself under 400yds. It was just a turd to feed in that Mod 700 shorty! It got traded off to a guy who liked it. Merry Christmas guys!