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The headspace of CIP 300 Whisper(TM) overlaps with 300 AAC BLACKOUT. The most they ever differ is by about 0.0004 inches.
There is more freebore in 300 AAC BLACKOUT, which was needed to allow for a 220 or 240 MK to be loaded to full magazine length and not jam the rifling. It also allows for higher velocity with any bullet, as you can sometimes use more powder before you hit the max pressure limits. Further, CIP 300 Whisper has a 3500 BAR (51,763 psi) max pressure and 300 AAC BLACKOUT is 55,000 PSI - though CIP does not measure the exact same way so it is hard to know how that translates.
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R&D for AAC
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