Steve, claydot is equal clays as stated above. I find claydot a 'tad' bit softer recoil. A fellow shooter who has been reloading for many years prefers claydot because of the so called pressure spikes with clays in 180gr. FMJ .40 loads, something to do with powder compression. Since I use 200gr Blue bullets I would not be affected. 3.7 gr. claydot/clays brings 168+PF. E3 is slightly harsher recoil and needs anywhere from a tenth to a half tenth LESS for the same FPS. As usual depends on bullet weight, barrel, etc. etc. When I switched to 40 major everyone swore by Vit N320, in my not so perfect opinion it is harsher recoil than either clay/claydot/E3.