I have an RCBS manual case trimmer that doesn't cut anymore.
It jammed up because lube(WC40) had acculuated too much gunk, so I pulled it apart, cleaned it and put it back together.

Now it doesn't seem to but the 6mm case necks.
Last time I used it was to square off 500 .308win case mouths, which I intend trimming once I have fired the batch in my chamber.

I haven't tried cutting any more .308 cases but it seems that the cutter is dull in close to the pilot where it contacts the 6mm necks.

It would have only cut a 1000 or so 6mm cases, I can't imagine that much work should dull it, should it?

It should still be sharp enough. Is your trim length still set to 308 Win?

call them and they will send you a new cutter, shaft, bearnig and handle,,i did this last year and it works like new.. mine probably has done a mmmm cases