Rocketman / Don,
You know that I have expressed my opinions.
But I would never stand in the way of progress.
As you rightly said CoF is very important and to this end we need to consider that early traps both manual and automatic used rubber buffers on the throwing arm.
Modern machines now use polyfluoro or polyvinyl material as blade buffers so I would think the CoF is considerably reduced.
Also in the single pellet airgun tests are we using 0.177", 0.22" or 0.09" pellets?

Finally is it so important to concentrate on single pellet breaks?
Should we not be spending research time on improving effective patterns.
Granted I will always accept 100 chips against 99 balls of dust but where is this one pellet break theory leading?