I was able to get my hands on some Alliant Power Pro 300 MP (+1 to Advanced Weapon Systems of BR). There is some load data on the Alliant website and I've searched through this forum and other online sources. There is some load data for the .44 mag pistol with 300 MP in the Hornady manual. Does anyone have some loading info sources (specifically velocity numbers) on using this powder out of a rifle (22" barrel)? I have an idea of what loads I'm going to make up for my next trial, but the data is all for 7-1/2" barrels. (Yea, I know that I need to get a chrono to be sure). Tks in advance.