I have a Redding body die,260 Rem) that i'm trying to understand how to properly measure shoulder bump. I can set the height to engage the shoulder or not but since the case seems to grow as I size the body, how do you measure a .002 bump?
I noticed that if the die contacts the shell holder, my neck is more out of round at this much travel after the sizing. I have less than .001 runout from a fired case, that goes to .0015-.0018 after the body die. I have been using the Lee neck die up to now but wanted to start bumping the shoulder back a bit since some are getting hard to chamber...about 5 firings.
The Lee die will give less than .001 runout and I feel I will need this die if I use the Redding die since it's playing with the neck concentricity.
The inside of the body is clean...no marks or debris.
I noticed that if the die contacts the shell holder, my neck is more out of round at this much travel after the sizing. I have less than .001 runout from a fired case, that goes to .0015-.0018 after the body die. I have been using the Lee neck die up to now but wanted to start bumping the shoulder back a bit since some are getting hard to chamber...about 5 firings.
The Lee die will give less than .001 runout and I feel I will need this die if I use the Redding die since it's playing with the neck concentricity.
The inside of the body is clean...no marks or debris.