You need to remember that Redding +0.0X" shell holders are not always the answer.
Because all chambers have +/- tolerances, and all sizing dies have +/- tolerances, you can have (and I have had) a situation where the headspace in a die is longer than the headspace of the chamber.
So when the case gets tight to chamber, you cannot "bump" the shoulder, because when you put the case into the die, the shoulder of the case does not touch the shoulder of die, so you cannot set it back.
In this situation, you must modify shell holders to have a "minus 0.0X" length. The standard shell holder has a standing hight of 0.125" +/- 0.001", and these are held to tight tolerances... but you may have to take 10 thou or more off of the top of the shell holder to be able to bump the shoulder back 0.001", if your chamber is shorter than the bump die's headspace.
I have a set of shell holders that are shortened by lapping on a plate with #800 carbide paper. Each one was made for a specific rifle, and specific die, to exactly match the chamber.
I have one shell holder that had to be taken down 0.023", before the die would touch the shoulder of the case.
The point of this is that there are no automatic solutions to the "bump" issue.
Here, kitty kitty kitty.
LRH member #23