Load data for .300 Win. Mag. + 150gr Speer Grand Slam

598 suitable loads across 102 powder(s) for cartridge .300 Win. Mag. with 150gr Speer Grand Slam bullet.

The most recommended powders for this combination are Alliant Reloder-17, ReloadSwiss RS 60 and Alliant Reloder-16.

Based on C.I.P., the max. allowed case length is 2.620 in / 66.55 mm, the max. cartridge length is 3.340 in / 84.84 mm, and the max. allowed pressure is 62,366 PSI / 4,300 bar.

Load Specifications

ImperialMetric

Bullet:.308 | 150gr | Grand Slam

Cartridge:.300 Win. Mag. load data

Case Length (L3):2.620" | 66.5 mm

Cartridge Length (COL/L6):•••

Seated Depth:0.355" | 9.0 mm

Case Capacity:90.5 gow | 5.86 cm³

Primer Size:Large Rifle Magnum (LRM)

Max. Pressure (C.I.P.):62,366 psi | 4,300 bar

Barrel Length:24.0" | 610 mm

Min. Twist Rate:1:16.0

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Community Loads for .300 Win. Mag. + 150gr Speer Grand Slam

Real loads for this combination shared by our community. Charge weights are only fully visible with an active Pro licence.

Charge (gr)	C.O.L.	Barrel Length	Velocity (fps)	Pressure (psi)

69.0 gr	3.285"	—	2979 fps	•••

76.0 gr	3.285"	—	2899 fps	•••
80.0 gr	3.285"	—	3051 fps	•••

•••	3.285"	—	3013 fps	•••

•••	3.285"	—	2960 fps	•••
•••	3.285"	—	3238 fps	•••

•••	3.285"	—	2968 fps	•••
•••	3.285"	—	3122 fps	•••

•••	3.285"	—	2936 fps	•••
•••	3.285"	—	3097 fps	•••

•••	3.285"	—	2869 fps	•••
•••	3.285"	—	3156 fps	•••

•••	3.285"	—	2887 fps	•••
•••	3.285"	—	3223 fps	•••

•••	3.285"	—	2860 fps	•••
•••	3.285"	—	3030 fps	•••

•••	3.285"	—	3057 fps	•••

•••	3.285"	—	2918 fps	•••

•••	3.285"	—	3096 fps	•••

•••	3.285"	—	2931 fps	•••
•••	3.285"	—	3089 fps	•••

•••	3.285"	—	2883 fps	•••
•••	3.285"	—	3030 fps	•••

•••	3.285"	—	3007 fps	•••
•••	3.285"	—	3153 fps	•••

•••	3.285"	—	3040 fps	•••
•••	3.285"	—	3182 fps	•••

•••	3.285"	—	2880 fps	•••

•••	3.285"	—	3070 fps	•••

Charge weights beyond the first rows and all pressure values are only visible with an active Pro licence.