Reloading The .300 Winchester Magnum Rifle
Posted on: Thursday January 7, 2021
(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|
125 grain JSP (Sierra Spitzer Point)
150 grain JSP (Hornady Spire Point)
|IMR 4895||64.0 gr.||3,210 FPS|
|IMR 3031||49.5 gr.||2,850|
|Reloader 12||59.0 gr.||3,105|
|Reloader 15||65.3 gr.||3,180|
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|
|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|
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|
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|
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.
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.