One thing that comes to my mind, is whether or not your FL sizing die is setting the shoulder back far enough on the Northwest brass to allow it to chamber correctly. What brand of sizing die are you using?
If you take a fired piece of this Northwest brass and a piece of Fiocchi brass, and run each through the sizing die. Do not do anything else to the brass, and hand place each piece of brass into the chamber. Are they chambering to the same depth? If not, it could be the die. Fiocchi 30 luger brass has the shoulder set back a fair amount in new ammo. It will fire form, but if the chamber is up to spec, not that much to the shoulder. Just a thought.
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