Ditto for me, a Tikka in 7mm mag, had to shorten the shell-holder about 0.003. I also have a 50's 8x57 Husky that is snug fit on a FL re-sized case. If the case comes out too short, I like the Redding shell-holders, the set comes with a 0.002 - 4 - 6 - 8 and 0.010.
Stuff happens, sometimes the chamber is not exactly right, sometimes the die is goofy and sometimes the shell-holder is off. Remember only we're playing with a couple of 0.001's here. I trouble shoot the shell-holder first, then the die and last it the rifle that has to go.
A "hot" load in a max chamber will also cause the above problem. The brass has been stretched (expanded) to the point that it takes allot of pressure to re-size. Some brass is real tough to re-size after it has been hot loaded. Even properly lubed cases will stick. Make sure the die is clean and shiny. Measure the fired case at the case web, expansion ring and at the shoulder, that may tell you something also.