Stan, I did enough work with Guilandi spreader wads to believe they work. However, I don't recall ever shooting a flushing clay over a dog. Ergo, I haven't worked on you question. But I do have a suggested test.
Suppose we fire a level shot from 54" above ground with Bowser at 30 yards and have a choke that delivers a nominal pattern of 30" at 30 yards. Bowser is 18" tall. So, the bottom of the pattern will pass 21" above Bowser. So, if you fired a test pattern at 10 yards you would expect a very high % of the pellets to be within 10" diameter/5" radius. Any individual pellet with a radius of 12" is going to be suspect of being capable of putting the 'ole ouch on Bowser. The 10 yard distance will allow you to capture fliers without going to unreasonably large paper.
DDA
