So pizza,
Basically what I understand is that the factory ammo is head spaced off of the mouth of the cartridge, and re-loads are head spaced off of the shoulder?
If this is the case, then this is a very unique round. I would rather that all of the rounds head spaced off of the shoulder. It seems to me that the brass of the factory rounds going off of the mouth are in a since slamming against the chamber dimensions. The re-loaded brass is fire formed to the chamber dimensions, and it would seem that it's a better fit for the chamber.
DBAR
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