I sawthis same question a while back. So I looked over the manual. They wanted to know if they could use loose powder in the rifle. When I read the manual, they make reference only to pellet powder. Not that loose powder would not work, but in the manual it talked of only pellet loads.

I would think that a person could use the loose powder. Keep it at 100 grains of less and I would not think you would have any problems. BUT... FOLLOW THE RECOMMENDATIONS OF THE MANUFACTURER.