The Lee case trimmer works. I like that system better than any other I've tried.
I just chuck the cutter/case gauge in my drill press, and slip the lock stud on the case head and with the press on low speed, I run the case up onto the spinning cutter. Works great. I can trim at least five cases in the time it take other guys to trim one. [img]/ubbthreads/images/graemlins/laugh.gif[/img]
You are limited to a fixed trim length with the Lee system, but you can actually shorten the gauge pin a bit (with a file or stone) for a shorter trim length, and I've actually pulled that pin out and put a grain or two of sand inside the hole, then put the pin back in for a longer gauge...
worked out great. [img]/ubbthreads/images/graemlins/smile.gif[/img]
But to answer your question, you need to trim the cases BEFORE you size them. With some grades of brass, you might be able to get the cutter length gauge into the sized case neck, but obviously the Norma isn't giving up enough neck tension to allow this.
In any event, you don't want to trim the cases after you've sized them. Pushing the mandrel (the length gauge) into the case mouth with some degree of force will just loosen your neck tension--and you don't want to do that.
Measure the cases which you have already sized. If they are not longer than 2.015" you'll be fine to go on and fire them, I feel sure. You'll of course have to get a micrometer... these can be had for around 25 to 30 dollars, and you need one BADLY! [img]/ubbthreads/images/graemlins/laugh.gif[/img]