If you're willin to forget about stupid dreq there is neat big book out there. I found it in used book store. The title is 'Shotshells and Ballistics' by John Taylor. It gives the following info for different loads from 10ga 89mm to .410 65mm: payload wt # of pellets, recoil energy, recoil velocity, velocity, avg pellet energy, time of flight in sec at 7 different distances plus shell characteristics. Really neat publication for comparing different loads of ALL TYPES.