If you're loading it longer than the recipe calls for because of the cannelure and it's plated, don't start at the bottom of lead wadcutter data. I stuck a plated wadcutter in the bore of my revolver doing that.
I wouldn't start any lower than 3.0 grains of Titegroup. (.38 lead WC data goes from 2.7 to 3.3) or 2.9 of B'eye.
Anytime you move the bullet farther out of the case, the pressure is going to drop, combine that with the long plated bearing surface of the plated WC you have to compensate with more powder.
I shoot a lot of plated WC's, they are accurate and clean shooting.
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