A few comments about shotfall distances and how to solve some issues with the CFO.
-Keep in mind that not every trap and skeet field is shooting on level ground. Thus, if you are standing on a ridge, shooting into a valley, etc. the shot will travel further. Just like when you are golfing, the ball does travel further if the landing area is below your feet. Add a tail wind and it goes further. The 300 M shotfall safety zone is not only for safety, but also for the distances to your neighbors property.
-One method to retain the shot within your property is to install shot screen curtains. The Windsor Sportsmen's Club has approx over 200 yards of these curtains that we raise up to about 40' and then lower them when the shooting is over. It is a pain, it takes time, maintenance, etc. but we are in the middle of the city now and we have been shooting trap and skeet since 1948.
-Another thought to consider is the angle of the shot pattern. Lots of trap clay target throwers also throw wobble trap. Sometimes the shooter gets onto the target quickly, and sometimes later , thus effecting the angle of the shotstring.
Elevation also affects the distance the shot will travel. Here's an example; St. Johns, NB 45' above sea level, Toronto 331 feet, Winnipeg 780 feet, Saskatoon 1544 feet, Calgary 3453 feet and Banff is over 4,800 feet (almost a mile). Do you think the shot travels further in St. Johns or Banff.
-Can you imagine the confusion if the CFO tried to apply a different set of rules and distances for every club? The 300 M zone is realistic and logical. It's not just because someone thought a even number would be easy to remember.
-The theoretical shotfalll zone for a trap field is approx 4 acres and a skeet field is approx 14 acres.
Just my two cents.