It's not easy to figure out with the info you've got at this point.....
Did you check the body length with a comparator? The reason I ask is that I've got to size my brass under SAAMI spec if I want it to chamber right.
Not much at all (new brass is all sized under SAAMI spec), but enough that it makes a difference.
FWIW, the way I got around that was taking the top of the shell holder down. Again, I only needed like 5 thou, but without that the brass wouldn't measure in.