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I tested two loadings with my model 642 1.87".
3.6 grains of Tightgroup gave me 651 fps or 122 ft/lbs
4.1 grains of Tightgroup gave me 751 fps or 163 ft/lbs
They are both very controlable loads. A pleasure to shoot even in an airlight frame. The hotter load didn't kick that much more and was just as accurate so I'm going to go with that. I have to say it's the most accurate bullet I ever shot! I'm actually going to carry these since they work so well.
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