One thing to consider is A.C. Jones book which suggests a single 7 1/2 pellet is likely to break a clay at 75 yards based on pellet energy at that range. He shows clearly that spin is a major factor, and tests by Neil Winston after the book was publish show pretty clearly by slow speed videos that spin does not decrease substantially over the flight of the clay. As I remember Digweed shot English 7's (like 7 1/2 here) out to close to 100 yards then went to English 6's (about 6 1/2 here). Digweed shot twice at each clay, which increases the chance of a hit but at 100 yards or more but even 2 well centered patterns still need luck for a single pellet strike.
