300 whisper vs 300 blackout

I thought it was the other way around? 300aac is a saami cartridge with (some sort of) standardization or pressure loads but 300 whisper isn't?

From what I can recall reading, now that I'm a couple of beers deep into Saturday night, was that 300 whisper loadings had pressure variations above that of 300aac. Therefore, blackout through a whisper barrel was fine but not vice-versa.
 
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The point is to add an extra $75 to S&W's bottom line every time someone buys their combo 300 whisper / AAC upper.

Good luck finding 300 whisper ammo! Not that the blackout ammo is that much more prevalent.
 
If I understand correctly, the difference is in the leade of the chamber. Case dimensions are the same.
My opinion is that the Blackout was a clever way to get around JD Jones patent.
 
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