Stu, that might be an exercise in futility. As you probably know, a lot of factory packed ammunition isn't loaded with powder that we can get off the shelf. Some are "blended". I did some research for you, and talked to a loader on another site who broke down one of the loads and said the powder looked like a blend, and it didn't look like anything he had on his bench. Some had thought that the new Superformance powder might be what is used in the factory ammo. If it is, Hodgdon isn't giving out any data that says so. As a matter of fact, one person I know actually called Hodgdon and asked for data for the .223, and he was told "The Superformance powder is for ONLY the cartridges and calibers that are listed with their Data on the site." This includes .22-250, .300, and some others .... but no .223. Perhaps we will get something in the future. They may not have finished testing enough to disclose data yet, or they may never do so.
Sorry ... wish I could be of more help.