That's what I'd check first, just to rule it out if nothing else.
C.O.L. range from 2.33 to 2.36 out of the 20 or so pull-downs I sampled.
That doesn't tell you where the shoulder of the brass is compared to the inside of the chamber. 3 thousands is a large number when trying to stuff a case in a chamber.
navlav8r suggested this
You can solve it by removing the expanding rod and incrementally turning the FL sizing die down a quarter turn or so, sizing a case and then trying to chamber it. Continue doing that until the case will chamber with very slight pressure. Then try another case or two to check your work. That will move the brass as little as possible. For that trial case(s) you’ll then have to run the expander down into the neck to load it.
If you reload a lot get a Hornady Comparator and then you don't have to guess. They are not that expensive. You will need a good set of electronic calipers to measure your case lengths. Once you get the length figured out with the comparator you can use it to set your full length resizer to get a minimum of resizing.
kwg
