AFAIK, the Ruger SBH was only ever made in .44 Mag - the .45's are Blackhawks, even though the frame sizes are the same (New Models only).
If the SBH feels best for you, but you want a .45, I would suggest you obtain a 7-1/2" barreled .45 Blackhawk and a SBH gripframe & grip panels, etc - then swap in the SBH gripframe onto the .45 cylinder frame.
If you want an unfluted cylinder, you're S.O.L., unless you want to have one custom-made.
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