Is there any tricks to chronographing a muzzle loader. I was shooting this weekend and I was getting some very inconsistent readings. I tried it at 8', 10', and 15' from the muzzle and my velocities were from 700 fps to 2300 fps with 90-110gr pyrodex 250gr shockwave. I have no problem with center fire or bows. I'm kind of new with the chrony so any help would be appreciated.