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Odd 6.5 CM Federal Case Difference

Hawk in WY

Private
Full Member
Minuteman
Sep 20, 2013
789
442
Jackson Hole, WY
Have Federal 6.5 CM cases some marked FC 6.5 Creedmoor and some the same but in bolder type.

The bolder type version has a larger case head diameter which required a different adjustment to Co-Ax primer system and noticeably smaller case capacity.

The plain FC case is almost exactly the same case capacity as Hornady brass. The bolder type version is smaller.

I believe the bold version had blue primer sealant.

Be careful out there.
 
I would bet that the one case is a Hornady case stamped fc. Then fc figured out the Creedmoor is here to stay and started making brass themselves.