Even with the extra room, isn't 13 to 14 a little on the high side for under 50 grainers?
I understand that fireforming for improved chamberings usually is best when you're at "book max" or really close (with a fastish powder) for the factory load, but I think that's kind of stiff. Blue Dot goes from mild to wild PDQ in my experience.
As for the forming, I would bet money you will find a heavy and light side on your cases. Get a level mirror and mark the low side, I'm pretty sure it will be the long side of the neck as well.
