257 Weatherby Magnum
Hornady 87 grain Spire Point ....IMR 7828.... 74.5 grains.... 3775 fps
Nosler 100 grain Spitzer......IMR 7828.....73.0 grains.....3655 fps
Hornady 117 grain boattail spire point......IMR 7828.....70.0 grains......3390 fps
Nosler 120 grain Spitzer.....IMR 7828.....69.0 grains.....3325 fps

300 Weatherby Magnum
Nosler 150 grain Spitzer..... IMR 7828.....89.0 grains.... 3425 fps
Nosler 180 grain Spitzer.....IMR 7828.....86.0 grains......3240 fps
Nosler 200 grain Spitzer.....IMR 7828.....83.0 grains......3065 fps
Hornady 220 grain Roundnose.....IMR 7828.....81.0 grains.....2940 fps.

**NOTE** These loads are maximum. Reduce them and work up.