Hornady's load manual lists load data for the 265gr under their 44 mag section as well as their 300gr.All Hornady bullets for the 44 mag are .430 diameter according to their book both lead and jacketed.
I don't suppose the Hornady manual gives any Vihtavuori powder charges for that bullet, does it?
If so, would you mind posting them?
As usual, finding an appropriate charge is proving hard to find!!
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Karma. Another word for revolver: because what goes around, comes around!