In calculating recoil, the effective muzzle velocity of powder gases can be significantly higher than the velocity of the shot and wads. It is estimated at 1.5 times shot veloctiy in "Hatcher's Notebook". This is based on similar results for 30/06 type military rifle cartridges. Apparently, once the shot and wad, or bullet, leave the barrel, the gases previously trapped behind them expand rapidly and leave the muzzle at high velocity. The 1.5 factor can have a noticable effect on computed recoil.
Last edited by vangulil; 12/18/06 01:00 AM.
