Factory 300 Blackout in a SSK 300 Whisper

[Spook]

Originally Posted by rsilvers

The slightly less body taper is to maximize the shoulder. Keep in mind, I am *not* saying it has less body taper than 221 Fireball, 223, or 5.56mm. I am saying we shoot for the shoulder being toward the larger end of the tolerance range that would be still be in spec for those other cartridges.

What exactly is it you hope to gain with a shoulder thats .002 larger?