I don't have any loads for you, but I know of a person with a pressure gun for testing. I have developed my own 12 gauge loads, and sent them off for testing. If you have the bullets, he can develop a load for you if he has the powder. Tom Arbrust at Ballistic research is very reasonable, and can develop the load with your components and bullets. He can be reached at 815-385-0037
I hope this helps Greg S