Beemerb got it "R-P-205.6gr
Military-205.6"
While Remington rifle brass is not necessarly MilSpec it is most always heavier than the other commercial brass. Heavier case with same outside dimensions equals less internal capacity. This is why most reloading manuals advise to load military brass to different levels than commercial brass. This is also why when changing any component in a load you should back up to mid levels and work it up again.
HTH
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