If you find data for both 38+p and minimum 357 Magnum that uses the same powder, you are likely to find a gap that can be worked for light 357. Bullseye is a good example, where you can split the difference and use the midpoint charge for starters, basically 4 grains versus 6, so you use 5 in the in the example of 120-125 grain lead. Reference Lyman Cast Bullet Handbook.
Lead bullets in .38 cases in 357 Revolvers, Advice.
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