Reloading The .300 Winchester Magnum Rifle

Posted on: Thursday January 7, 2021
Reloading The .300 Winchester Magnum Rifle
MD Smith

MD Smith


(FN=Flat Nose, SP= Spire Point, HP= Hollow Point, RN= Round Nose), JHP= Jacketed Hollow Point, FMJ=Full Metal Jacket)

Loads for .300 Winchester Magnum Rifle:

(Note: These are near maximum loads, you should use 10% less to start.)
(See note on Powders below or read all about various Powders.)
Bullet is .308″ diameter. 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.

110 grain JSP (Jacketed Spire Point)
H4895 68.0 gr. 3,494 FPS
H380 72.0 gr. 3,638
A2700 78.5 gr. 3,656
A3100 82.0 gr. 3,419
125 grain JSP (Sierra Spitzer Point)
H4895 49.0*gr. 3,309 FPS
H380 49.0*gr. 3,403
A2700 45.0 gr. 3,478
A3100 82.0 gr. 3,373
150 grain JSP (Hornady Spire Point)
IMR 4895 64.0 gr. 3,210 FPS
H4350 74.0 gr. 3,244
IMR 3031 49.5 gr. 2,850
Reloader 12 59.0 gr. 3,105
Reloader 15 65.3 gr. 3,180
H380 71.0 gr. 3,303
A2700 69.5 gr. 3,177
A3100 76.0 gr. 3,108
165 grain JSP (Spitzer Point)
H4350 73.0 gr. 3,188 FPS
Reloader 12 62.0 gr. 2,935
Reloader 15 62.6 gr. 2,980
Reloader 19 74.6 gr . 3,070
Reloader 22 79.4 gr. 3,135
H380 67.0 gr. 2,997
A2700 67.0 gr. 2,959
A3100 73.5 gr . 2,945
180 grain JSP (Spitzer Point)
H4350 71.0 gr. 3,079 FPS
IMR 3031 58.5 gr. 2,900
IMR 4895 59.0 gr. 2,950
Reloader 19 72.3 gr. 2,990
Reloader 22 76.9 gr. 3,030
A2700 66.0 gr. 2,879
A3100 72.0 gr. 2,899
200 grain JSP (Sierra Spitzer Point)
H4350 68.0 gr. 2,807 FPS
Relaoder 19 68.0 gr. 2,810
Relaoder 22 73.4 gr. 2,875
A2700 62.0 gr. 2,697
A3100 69.0 gr. 2,703
220 grain JSPCL (Speer soft point “Core-Lokt”)
H4350 66.0 gr. 2,694 FPS
IMR 3031 52.5 gr. 2,505
IMR 4895 53.5 gr. 2,525
A2700 59.5 gr. 2,445
A3100 67.0 gr. 2,560

Discussion: I have listed powders of IMR, Hodgdon, Alliant and Accurate. Use which ever you have handy. Slow burning powders generally work better in longer barrels and heavier bullets. 300 Mag. Cases will stretch, especially with hot loads, and you definitely need to check each in a case length guage and trim off excess brass. Of course, discard any cases that show a split anywhere on the case. For hunting at long distances with an unobstructed view, you should choose the spire point with a soft lead tip. For hunting at shorter ranges in brush, as is common in the woods of Alabama, you should choose a round nose bullet. They are less easily deflected and/or deformed by brush that you may be shooting through. The flat nose bullet is used especially in tubular fed magazines to prevent pressure on the primer in the cartridge above it.
There are a number of other high performance bullets on the market. The “boattail” is a very good long range target match bullet. It has very good wind performance. If you are shooting for precision, you should weight each powder charge and put exactly the same amount in each case.

The .300 Winchester Magnum Rifle
Actually ALL 30 cal. bullets are .308 in diameter.

*
#2400, Reloader 7, 11, 12, 15, 19 and 22 are products of Alliant (formerly Hercules) Powders.
H380, H4350 and H4895 are products of Hodgdon Powders.
IMR 3031 and IMR 4895 are products of IMR (formerly DuPont) Powder Company.
#2700, and #3100 are products of Accurate Arms Company
WMR, WSF, WSL, 760, 748, 680, 231 and 540 are products of Winchester, Components Div.
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.