Rule of 16ths   "How does the rule of 16ths apply to shotgun fitting?"   The “rule of 16ths” has been employed by gun fitters for more than 100 years. It is used to estimate the amount of additional cast-on or cast-off needed to yield the correctpoint of impact (POI) for a given shotgun and a given shooter. Basically, the rule says that for every 16th of an inch of cast added or subtracted from a shotgun at the heel, the point of aim (center of the pattern) will be affected by one inch for a target that is 16 yards from the shooter. So theoretically, if you are shooting two … [Read more...]