Hello all. I did a search and came up with nothing. Anyway, I bought some 210gr Barnes TTSX bullets to run in it. The powders I have on hand are Win760/H414 , RL19, RL22, 7828ssc. I have the Mark V Alaskan with 26" bbl. thanks so much!!
www.Reloadersnest.com shows both your R22 and 7828 powders ( from 89-90gr MAX) I used 82gr H4350/210XBT in new Weatherby brass back in '98 out of a MGM 340W for some African game. Its an awesome round! good luck to you Pard.