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Arghh! Can't believe what a dipstick I am. Not only what Kodiac mentioned about a little math, but I've also got a copy of J.S. Hatcher's "Textbook of Pistols and Revolvers" which gives all kinds of formulae for interior and exterior ballistics (it's a neat old book). I now remember seeing a formula for recoil impulse from muzzle energy and weight of the gun. May not be the same as firing each of two handguns but it's a start. This is what happens when you miss a week at the range and don't have any fun- you start forgetting things.
Kodiac, I also second your remark about muzzle blast.
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