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Reloading The .378 Weatherby Magnum

Loads for .378 Weatherby Magnum:
(Note: These are near maximum loads, you should use 10% less to start.)
(See note on Powders below or read all about various Powders.)

Due to different barrel lengths, type of bullet, seating depth, primer type and other factors, you may not get near the FPS charted. It is just a guide and the reason you should start under these charges and work up.

235 grain JFP (Jacketed Flat Point)

    H450       117 gr.   3,147 FPS
    H4350      109 gr.   3,224
270 grain Hornady JSP (Jacketed Soft Point)

    H4831       115.0 gr.  3,102 FPS
    Reloader 19 110.8 gr.  3,110
300 grain Barnes Solid

    Reloader 19 108.6 gr.  2,960 FPS
    Reloader 22 114.0 gr.  2,965

Discussion: Only Alliant (Reloader 19 and 22) and Hodgden (H450 and H4350) show loads for the .378 Mag. I have never shot one, but I included these charges here just because of the sheer power of a 300 grain bullet moving at 3,000 Feet Per Second. Talk about stopping power!
Bullseye, Unique, 2400 and the RELOADER series, are products of Alliant (formerly Hercules) Powders.
Clays, Universal, HP38, HS6, H4895, H450 and H4350 are products of Hodgdon Powders.

References: Accurate Arms Co. 1996 Reloading booklet - - Alliant Powder Co. Reloaders' Guide (1995) - - Hodgdon's Basic Reloaders Manual (1996) - - Speer Reloading Manual, #12 - - Winchester Reloading Components Manual, 14th edition - - Lyman Piston & Revolver Reloading Handbook, 2nd edition. - - VihtaVuori Oy Company, reloading booklet (1995) - - Numerous magazine articles on reloading special calibers and personal loads where noted.

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This page created by M.D. Smith and last modified on June 26, 1997 ©