Originally Posted by bigbuck
Can you explain a little more about the partial full lenght resize process that you do ?
Well one of the problems is that there is not a set of definitions for the different kinds of sizing. I come by mine through the various forums and have settled on these:
Partial Neck Sizing - sizing part of the neck and leaving part of the neck as a fire formed exterior do-nut, no sizing of the case body or pushing the shoulder back
Neck Sizing - sizing all the neck but not sizing any part of the body or pushing the shoulder back
Partial Full Length Resizing - sizing all of the neck, sizing the case body and pushing the shoulder back a minimal amount so there is some contact at the shoulder between the chamber and case
Full Length Resizing - sizing all of the neck, sizing the case body and pushing the shoulder back so there is no contact between the chamber shoulder and case shoulder
Like I say, this is my understanding and references are hard to find but here are three
Full Length, Partial & Neck Resizing
Varmint Al's Handloading/Reloading Page
Collecting and Shooting the Surplus Rifle - Cartridge Case Sizing, Stretching, Trimming & Lubing
So once your case has expanded enough to have a crush fit in the chamber, then you can resize to set the shoulder back .001" or so. Like Montana Marine says you can leave an exterior do-nut
and this may help. It did not make a demonstrable difference in my limited testing but I thought it should have! You can also leave one of these by putting a washer around the case when using a Lee Collet
or by the adjustable bushing type dies.
Consistancy is the key and if you are neck sizing until you have a crush fit, then the case dimensions are changing, very minimally but changing nonetheless. Once you have fully expanded the case, sizing to set your shoulder at the exact same point everytime and make sure your brass has the same amount of work hardening, then you are the closest to duplicating the exact same case prep everytime.
For me that is crush fit, partial full length and annealing everytime so the case dimensions and bullet grip are exactly the same everytime, or as close as I can make it.