First off, how many times has that brass been loaded? Have you check for incipient case head separation using a hooked paper clip? If you did and felt no groove in the brass and the primer pockets are still reasonably tight then that brass should be good to use some more. The following is something I wrote up and posted in another forum which they added as a sticky. You can use is as is or with a neck sizing die. Even so, with neck sizing you need to do a full length resize every now and then. Ss a matter of fact, using these instructions may negate the need for neck sizing entirely. My loads are just as accurate by this method as when I neck size. The main thing with this system is to push the shoulder back only the minimum amount necessary for smooth easy chambering.
This is how I set up my sizing die for bottleneck cartridges.
1. Take a once fired factory case from your rifle and blacken the neck and shoulders with a Magic Marker or Sharpee pen. Some people like to smoke the neck and shoulder, but I find the Magic Marker/Sharpee pen a bit better.
2. Carefully lubricate the case.
3. Loosen the lock ring on the sizing die and back off about two turns from when the die is set to touch the shell holder.
4. Size the case. Note where the marks are on the case and turn the die down about a half a turn and size again. Turn down some more, and resize again. What you are looking for is the marks on the blackening just touching the shoulder.
5. Clean the lube from the case and try it in the rifle. It may chamber just a bit on the snug side. If so, turn the die down ever so slightly, lube and size again. Wipe off the lube and try in the rifle. If it slides in as easily as a factory round, you should be good to go. If not, usually one more very slight adjustment should fix the problem.
6. Tighten the locking ring for the die and you're done. You have just set your sizing die up for a custom fit to your specific rifle, rather than a generic one size fits all guns.