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The changes include changes to fluff and modifications to the effective range, recoil, report, DR, and capacity because of the new ammunition, listed below.
EDIT: Based on feedback, I have decided to change it to a PDR4 rating. This is based on the fact that it produces similar muzzle energies to a common "sniper rifle" round in 308 Win; it just doesn't have the velocity to carry the round as far.
Though the DR of the ammunition is changing, the rifle effectively is not -- only taking on a new ammunition type. Therefore, the rifle need not be resubmitted for review, but if the rifle's text has not been updated to reflect this new ammunition, it should be before I approve it.