i was just given a hawken 50 cal. 1983,28 inch barrel,not sure of the twist. was given a box of .490 ball,and.15 pre lubed patches,2 cans of FFg powder. is this good ? or i'm i dealing with somethig nobody would use?i'm a great shooter but can't get a small group at 50 yards with this. i've tried 65 to 95 grain of powder with out any consistency.are balls correct? if not any help would be great... thanks