I have reloaded/experimented for a Rem. 722 in 257 Robt. more than for any other cartridge. I finally ended up using 120gr Nosler Partition over 46.5 H4831sc, a load developed by John Barsness in Rifle/Handloader magazines. The load uses CCI 200 primers and WW super brass. John reasoned that since the 6mm is an offspring of the 257 and is loaded to a higher psi, the 257 could be also loaded to a higher psi in modern rifles.

I have used this load for two deer, killed them quick, and shows no pressure signs in my gun.

My older notes shows another good load using 120 Grand Slams, over 43gr. of IMR 4350, also w/ CCI 200 primers and WW Super brass.

Of course, start 5% below these powder amounts and work up carefully.

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beaver