I like the Bergers in my 300 WSM! They did well on my 200 yd Antelope. Expanded without blowing up.
My dad has a 270 WSM and uses Magpro with heavy bullets successfully. He likes the ease of throwing charges.
If throwing is not an issue, I think I might lean towards a Hodgden Extreme propellant like H1000, Retumbo,etc. or R22/R25.
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