Reloading The .300 Weatherby Magnum Rifle

Posted on: Thursday January 7, 2021
Reloading The .300 Weatherby 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 Weatherby Magnum Rifle (The most powerful .30 caliber cartridge in the world):

(Note: These are MAXIMUM loads (unless otherwise noted), 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 76.0 gr. 3,839 FPS
H380 78.0 gr. 3,752
IMR4895 73.0 gr. 3,660
IMR4064 75.0 gr. 3,674
IMR7828 92.0 gr. 3,640
IMR4831 84.0 gr. 3,676
Reloader19 90.0 gr. 3,611
125 grain JSP (Sierra Spitzer Point)
H4895 71.0 gr. 3,478 FPS
H380 75.0 gr. 3,501
H4831 89.0 gr. 3,590
H1000 94.0 gr. 3,277 (lower pressures)
IMR7828 90.0 gr. 3,588
IMR4831 82.0 gr. 3,494
IMR4350 80.0 gr. 3,529
IMR4320 72.0 gr. 3,419
A8700 93.0 gr. 2,954
A3100 85.0 gr. 3,392
A4350 83.0 gr. 3,642
VV N160 88.8 gr. 3,612
150 grain JSP (Hornady Spire Point)
H4895 69.0 gr. 3,325 FPS
H380 72.0 gr. 3,323
H4831 86.0 gr. 3,369
H1000 94.0 gr. 3,279 (lower pressures)
IMR7828 89.0 gr. 3,377
IMR4831 81.0 gr. 3,324
IMR4350 78.0 gr. 3,304
A8700 93.0 gr. 2,950
A3100 85.0 gr. 3,313
A4350 79.0 gr. 3,333
VV N160 83.6 gr. 3,282
VV N165 90.8 gr. 3,300
Reloader19 82.5 gr. 3,375
Reloader22 88.0 gr. 3,460
165 grain JSP (Spitzer Point)
H4895 66.0 gr. 3,110 FPS
H380 68.0 gr. 3,066
H4831 84.0 gr. 3,339
H1000 93.0 gr. 3,224
IMR7828 87.0 gr. 3,272
IMR4831 80.0 gr. 3,184
IMR4350 75.0 gr. 3,151
A8700 93.0 gr. 2,860
A3100 85.0 gr. 3,233
A4350 76.5 gr. 3,171
VV N160 82.9 gr. 3,193
VV N165 89.6 gr. 3,216
Reloader19 80.5 gr. 3,250
Reloader22 85.0 gr. 3,305
180 grain JSP (Spitzer Point)
H4350 74.0 gr. 2,990 FPS
H380 64.0 gr. 2,900
H4831 81.0 gr. 3,127
H1000 91.0 gr. 3,152
IMR7828 85.0 gr. 3,200
IMR4831 78.0 gr. 3,014
IMR4350 74.0 gr. 3,040
A8700 93.0 gr. 2,835
A3100 82.0 gr. 3,137
A4350 74.5 gr. 3,059
VV N160 80.0 gr. 3,038
VV N165 86.7 gr. 3,079
Reloader19 78.0 gr. 3,120
Reloader22 80.0 gr. 3,115 (Nosler Partition bullet)
200 grain JSP (Sierra Spitzer Point)
H4350 71.0 gr. 2,770 FPS
H450 70.0 gr. 2,744
H4831 75.0 gr. 2,880
H1000 81.0 gr. 2,897
IMR7828 78.0 gr. 2,916
IMR4831 74.0 gr. 2,766
IMR4350 70.0 gr. 2,774
A8700 93.0 gr. 2,787
A3100 80.0 gr. 2,987
A4350 73.0 gr. 2,942
VV N165 83.1 gr. 2,949
Reloader19 74.0 gr. 2,995
Reloader22 78.0 gr. 2,970
220 grain Jacketed RN
H4831 74.0 gr. 2,707
H1000 80.0 gr. 2,717
H870 92.0 gr. 3,008
IMR7828 75.0 gr. 2,647
IMR4831 71.0 gr. 2,688
IMR4350 67.0 gr. 2,656
A8700 93.0 gr. 2,761
A3100 77.0 gr. 2,810
A4350 69.0 gr. 2,703
Reloader19 71.0 gr. 2,709
Reloader22 75.0 gr. 2,785
250 grain Jacketed RN
H4831 71.0 gr. 2,507 fps
H1000 77.0 gr. 2,571
H870 88.0 gr. 2,704
IMR7828 73.0 gr. 2,556
IMR4831 66.0 gr. 2,469
Reloader19 67.0 gr. 2,516
Reloader22 72.0 gr. 2,633

Discussion: This is the most powerful .30 caliber cartridge in the world (commercially made). It can take any game in North America and any thin skinned game in the world. Depends on the type and weight of bullet. You have many choices from the 110 grain light varmint bullet to the 250 grain heavy-weights.

I have listed powders of IMR, Hodgdon, Alliant, VihtaVuori 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 or a hollowpoint ( depending on the game).

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.

Reloading The .30-06 Rifle

Actually ALL 30 cal. bullets are .308 in diameter.

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, IMR
7828, IMR 4831, IMR 4064 and IMR 4895 are products of IMR (formerly DuPont)
Powder Company. #2700, #4350, #8700 and #3100 are products of Accurate Arms
Company WMR, WSF, WSL, 760, 748, 680 and 540 are products of Winchester,
Components Div. N160, N165 and N140 are products of VihtaVuori Oy Ammunition
Unit.

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.