Load data for .300 RCM + 150gr Speer Grand Slam

Based on C.I.P., the max. allowed case length is 2.100 in / 53.34 mm, the max. cartridge length is 2.840 in / 72.14 mm, and the max. allowed pressure is 63,817 PSI / 4,400 bar.

Load Specifications

ImperialMetric

Bullet:.308 | 150gr | Grand Slam

Cartridge:.300 RCM load data

Case Length (L3):2.090" | 53.1 mm

Cartridge Length (COL/L6):•••

Seated Depth:0.290" | 7.4 mm

Case Capacity:75 gow | 4.86 cm³

Primer Size:Large Rifle (LR)

Max. Pressure (C.I.P.):63,817 psi | 4,400 bar

Barrel Length:24.0" | 610 mm

Min. Twist Rate:1:16.0

Get PRO license to unlock all data and calculators

Community Loads for .300 RCM + 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)

61.0 gr	2.820"	—	2899 fps	•••

56.9 gr	2.820"	—	2906 fps	•••
62.9 gr	2.820"	—	3186 fps	•••

•••	2.820"	—	2779 fps	•••
•••	2.820"	—	3036 fps	•••

•••	2.820"	—	2898 fps	•••
•••	2.820"	—	3184 fps	•••

•••	2.820"	—	2719 fps	•••
•••	2.820"	—	2997 fps	•••

•••	2.820"	—	2684 fps	•••
•••	2.820"	—	2971 fps	•••

•••	2.820"	—	2687 fps	•••
•••	2.820"	—	2952 fps	•••

•••	2.820"	—	2799 fps	•••
•••	2.820"	—	3059 fps	•••

•••	2.820"	—	2788 fps	•••
•••	2.820"	—	3047 fps	•••

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