The only concern I'd have with roll crimping over the shoulder of the SWC bullet would be that you'd be seating them a lot deeper, and that would significantly reduce the interior volume in the case. That's going to raise the pressure. Not as much as with a 9mm, but still enough to be significant. I'd definitely reduce the powder charge to the bare minimum and shoot a few over a chrony to see if the velocity numbers line up with the predicted velocity that the book predicts for the load.

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