Same weight plated bullet should use the same load as a cast bullet.
Hodgdon, for some daft reason(likely to have increased velocity in their data) used an 8 5/8" barrel in their tests. Your 5.5" barrel will give much lower speeds with the same loads. Accuracy is more important than velocity anyway.
Berry's site shows their bullets have 2 thicknesses of plating too. Each has a max velocity. Standard thickness is 1250 FPS. Thick-Plate is 1500 FPS.
Keep in mind that you can load .44 Mag cases to .44 Special velocities with no fuss. Just like you can load .357 cases with .38 Special.
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