The newest Sierra manual lists updated fully modern data for the Mag Duece as well as the Berger manual.
If one is inclined, Sierra also lists full power loads for the 223 AI, which incidentally has the same powder capacity as the 222 Mag.
If I get a chance, I can post the data.
The 222 Mag SAAMI is 5,000 psi less pressure than the 223 and about 12,000 psi less than the 5.56 NATO, due to its use in break top single shots and the Savage 340.
