While I'm getting caffeinated, here's a link to a good piece at RevolverGuy.com on the factors involved in regulating the sights on a revolver so that Point-of-Aim and Point-of-Impact have more than a notional relationship to each other.
One thing that can make it trickier is that most revolver chamberings offer a wider range of bullet weights and velocities than traditional autoloader rounds. Expecting, say, a 2.5" Model 686 to shoot to the same point of impact with 148gr .38 Special target wadcutters at 650fps and 125gr .357 Magnum loads at better than double that velocity is unrealistic.
"Let’s start with velocity. A fast bullet will exit the barrel more quickly than a slow one, which means that it will exit earlier in the barrel’s rise under recoil. The result is a bullet that hits lower on the target, all else being equal. The reverse is true for a slower bullet than normal, which can print higher."
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| Gratuitous old Model 34 Kit Gun photo |
