When I chronographed the .357 years ago through a 20-inch Marlin, I got from 1600-2100 FPS, depending on bullet weight.
Don't recall what I was getting with the .38-55 handloads through the 24-inch Marlin.
One thing to consider in .357s is that the lighter bullets are not built to be driven so much faster & may disintegrate on impact, reducing penetration.
Go heavy & well-constructed in a longer barrel.
Denis
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