Hey man haven't read though all the posts so may well have been suggested but wsm's shoulder angles are notoriously hard to bump back. After own a 7mm wsm i had to chamber my brass before reloading to make sure it would not get stuck upon firing.
It's a fine line bumping the brass back enough vs denting the case.
I suspect it may be a tight cambering and possibly worth talking to a Smith about reaming the chamber foward a few more thou.
Good luck
The correct way to adjust a die and shell holder if you can't push the shoulder back far enough is to take a bit off the top of the shell holder then mark the shell holder.
The dies are hardened and while a bit can be taken off the bottom of the die the shell holder is the best piece to take a bit off, it's cheaper to replace than the dies.
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