I had my new to me T/C Hawken .54 at the range today. First shots have been sixty grains of FFF with patched round ball. I tried at 50 and wasn't hitting the target. Moved the target to 25 and was hitting 6 inches to left but okay on elevation. I've moved the rear leaf as far as it will go, with the hole only moving three inches closer to point of aim. Anyone have suggestions? Thanks in advance.