It is very clean, much more than 777. It also gives higher velocity than equal amount of 777. I also think it works better with heaver bullets, 250 gr.and up, also better results with longer barrels, 26 inch and up. I had a little trouble getting it to produce the same vel. from shot to shot, using a chronograph. I have weighed out some charges, versus by vol., and I am going to try to try that out this weekend.