I think my rifle's neck is about .295, based on case springback. The reamer was marked .298, but there is no way a .298 neck would yield fired necks that measure .2935 to .294.
.295 is a good diameter for Win brass, which measures .294-.295 unturned with a 142 SMK. I have heard you want between .002 and .005" clearance between the case neck of a loaded round and the chamber.
Now there are guys who like a tight neck, like .290 to .292. There is a lot more variation in that sort of stuff in the 1000 yd game.
