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I was disappointed with the velocities I was getting out of my Model 36 (all steel j frame), in the 550 to 750 fps range, so I started working on finding a better defense load.
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Energy is a function of 1/2 of the velocity (feet per second) squared times the weight of the bullet dividied by 7000 (to convert grains to pounds) and by 32.2 (to convert weight to mass).
Out of a 1.875 inch barrel, you may find that energy - and hence lethality - comes from heavier bullets with faster burning powders. Look, for example, at Bullseye with 158 grain bullets.