Under the General Semi-Auto Forum, the question is posed "How does bullet weight affect recoil?" My contention is that it is the ratio of gun weight/bullet weight that affects recoil, with velocity increase a secondary factor.
Try this: Fire a +P .38 Special, 158 gr. JHP round in an L-framed Smith and Wesson. Then fire the same type of ammunition in a lightweight J-Framed revolver. The little lightweight will react more violently.
Now, fire a 158gr. .38 Special round in the L-Framed gun, and follow with a 158 gr. .357 Magnum round. There is a noticable difference in recoil.
Finally, fire a 110gr. .357 Magnum round followed by a 158gr. .357 Magnum round in the L-Frame. Again, noticable difference.
Not a scientific test, to be sure. But it has led me to believe that increasing bullet weight affects recoil more than increasing velocity.
Make of that what you will.
I think you make a good point, Bob. I recently shot some high velocity frangible rounds out of my S&W 686 - a very light bullet (I don't know the actual weight) and there was noticeably less recoil than with the Remington JHPs I had been shooting.
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