After you have trimmed your brass to minimum length, and re-chamfered, I suggest that you turn a couple of necks to different thicknesses, fire rounds made with those cases, and check to see if your bullet will slide in with minimal finger pressure. Start with the lightest cut that will clean up the outside of the necks. That may be enough. There is a theory that has been favored by some top shooters that having a little more clearance may give a more consistent bullet release, which shows up as increased accuracy at longer ranges, not so much at 100 yards. For my 6PPC brass this has caused me to turn cases for a clearance in the .0025 to .003 range. I would think that thicker necks might have stronger snap back after firing. Mine are turned for .262 or .263 chamber necks. I have read of long range benchrest competitors using .005 clearance for .30 caliber. Basically, I do not think that additional clearance up to a reasonable limit will harm accuracy. I think that it is mostly a brass life issue, and not much of an issue there, given what I have seen in the way of brass life, with proper dies, with unturned necks and factory clearances.