Originally Posted by Sully2
IF you have 1 RIFLE of that caliber ONLY then you can do what Hunter Welch said. BUT it might work ONLY in that one rifle. If you have 2 in that caliber...then you MUST go the whole route
US military rifle teams shooting 30 caliber magnums in 1000 yard matches will disagree with this. The shot their best scores using new .300 Win. Mag. cases or .338 Win. Mag. ones necked down to .30-.338. And one several-hundred round batch of ammo did very well indeed across a dozen or more rifles. Civilians did the same thing.
My best 15 to 30 shot test groups with my .30-.338's at a thousand were smallest with either new cases or fired ones full length sized properly. They're equal or smaller than current benchrest records. I and others never got best accuracy with neck sizing previously fired cases.
So you don't need to go the whole route. Unless you really can't full length size your fired belted cases correctly.