When I lived in Vail CO I carried a 6" Blackhawk loaded with 180 grain JHP over 15+ grains of 4227. The book said it pushed 1250fps from a 6" barrel and even twith the mass of the Blackhawk it kicked like a mule. It showed all the signs of pushing the pressures to the limit, but with Ruger over over building thier guns I did not worry too much about it blowing up. I don't think I would even consider firing such a load from any K frame and would not make a habit of it from an N frame.

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Regards,
Guy-Harold Smith II