Why play round when you can get a redding custom deluxe three die set in 6.5x257 weatherby for it. If I remember correctly about 380 nz is what they cost me. 264 Winchester magnum brass will also work but a little short until fireformed.Just run through full length die and 98% formed. ADI 2217 is the powder im using in mine with a sierra mk 142gr norma brass and fed mag primer. Running this threw a bartlein 31 inch barrel. I am Cruising it but exceeding 6.5x284 velocity. Hope this helps you
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