Originally Posted By: A-dogNine horses, I understand full length sizing as re-forming brass back to original specifications. Since I am firing the brass from the same cooper 204, I am trying to get a bit more of a custom fit by simply bump sizing the fired brass. This way, the brass will be fireformed for that specific chamber. I have attempted to do this by simple backing the full length sizing die out of the press a bit so not as much of the brass will be run through the die in an attempt to preserve some of that custom fireformed shape. Does this make a bit more sense? I do not have a neck sizer, which is why I am going this route.
GLShooter, can you recommend the best way to grid down a shell holder? I am worried that I would grind it a bit unevenly, making lopsided brass.
You can partially neck by backing a die out but that doesn't really touch the shoulder. It will size the forward part of the case somewhat that will help in cartridge seating.. If you get NO movement at all when you are at full die taking the top off the shell holder will give you more reach. It doesn't have to be perfect as if you go down 0.010 it isn't going to hit anyway.
Anytime you "bump" a shoulder with a F/L die it is sized all the way. The second you touch that shoulder you are at full case sizing. Your option is to buy a Forester bushing die and just use it as it will do both an d not touch the body.
On a bolt gun NS only is fine as long as they are not overly tight. At some point a F/L size will be in order.
Greg
