Home Forums Hunting & Shooting Ask The Gunwriters 257 Wby Mag questions

The OP asked for starting data.....

Speer #15 lists a starting load for 100 grain bullets of 67.0 grains of IMR7828 and a CCI 250, giving 3306 fps.

Hornady #9 Lists a starting load for 100 grain bullets of 60.3 grains of IMR 7828 SSC and a Fed 215, giving 3100 fps.

Nosler #5 lists a starting load for 100 grain bullets of 65.0 grains of IMR 7828 and a Fed 215, giving 3237 fos.


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