The 16g F2 Classic is factory listed at 9,867 psi but testing by Tom Armbrust in 2007 or 2008 showed it to be 10,500. The problem is apparently coverting CIP to SAAMI pressures.
That said, B&P MB Classic 1 1/8 oz. is my big country pheasant load, and I'm anxious to try the Competition One 7/8 oz loads.