I got drawn for a multi-season elk tag and need to pull my Thompson Center Hawken out and get it shooting again. I bought a new pound of Triple Seven and discovered, when I got home, that it is fffg instead of ffg. Anybody have advice as to whether or not I can use it in my .50 cal, or do I have to get another pound of ffg? It's 4.5 hours to the nearest powder store! If it is useable, what loadings? My bullets are 348gr. Powerbelts.