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As I said, call Western, or Sierra, or whomever you wish that actually tests some volume. Or read about it in the A-Squared manual, this isn't new. Even Charlie Sisk has gotten really good at blowing the ends of barrels off due to secondary ignitions.
Unless you are pressure testing, the usual suspects won't show it. This is obviously a different cartridge, but it is the exact same phenominon. Look at the pressures, but notice the velocity? Even if you chrono'd this, you wouldn't "see it". Think the barrel harmonics are different?
http://i78.photobucket.com/albums/j8...psmopqcu83.png