This table tells you how many inches to lead the target in inches based on target speed. Determine the Yardage and Speed of Target to determine how many inches to lead the Target.
An easy way to memorize this formula is to think in factors of 3. Walking tagets have a 3 MPH lead, then double them for a trotting target and triple them if it's at a dead run.
The easiest way to remember the 3 MPH moving target leads is to COUNT IN SEVENS -- 7, 14, 21, 28, 35, 42 and you'll have the correct walking leads almost perfectly for 100, 200, 300, 400, 500 and even 600 yards.