With the 150 SST, I've tried both powders in my 20" barrel .308 and get better accuracy and velocity from 2206H. It's a faster burning powder that works well in shorter barrels. That's in my particular rifle and not necessarily your rifle. There's not a great deal of difference between them velocity wise with the 150gr bullets anyway so just use what gives you the best accuracy or what you have on hand.
Bookmarks