Load data for .300 Rem. Ultra Mag. + 180gr Sierra GameKing

405 suitable loads across 67 powder(s) for cartridge .300 Rem. Ultra Mag. with 180gr Sierra GameKing bullet.

The most recommended powders for this combination are Hodgdon Retumbo, ReloadSwiss RS 76 and ReloadSwiss RS 80.

Based on C.I.P., the max. allowed case length is 2.850 in / 72.39 mm, the max. cartridge length is 3.600 in / 91.44 mm, and the max. allowed pressure is 64,977 PSI / 4,480 bar.

Based on C.I.P., the max. allowed case length is 2.850 in / 72.39 mm, the max. cartridge length is 3.600 in / 91.44 mm, and the max. allowed pressure is 64,977 PSI / 4,480 bar.

Load Specifications

ImperialMetric

Bullet:.308 | 180gr | GameKing

Cartridge:.300 Rem. Ultra Mag. load data

Case Length (L3):2.850" | 72.4 mm

Cartridge Length (COL/L6):•••

Seated Depth:0.594" | 15.1 mm

Case Capacity:112.5 gow | 7.29 cm³

Primer Size:Large Rifle Magnum (LRM)

Max. Pressure (C.I.P.):64,977 psi | 4,480 bar

Barrel Length:24.0" | 610 mm

Min. Twist Rate:1:12.5

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Community Loads for .300 Rem. Ultra Mag. + 180gr Sierra GameKing

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)

87.0 gr	3.598"	24.0"	2837 fps	•••
88.7 gr	3.598"	24.0"	2884 fps	•••
90.3 gr	3.598"	24.0"	2926 fps	•••
•••	3.598"	24.0"	2974 fps	•••

•••	3.598"	24.0"	2911 fps	•••

•••	3.598"	24.0"	2717 fps	•••
•••	3.598"	24.0"	2821 fps	•••
•••	3.598"	24.0"	2864 fps	•••
•••	3.598"	24.0"	2906 fps	•••

•••	3.598"	24.0"	2741 fps	•••
•••	3.598"	24.0"	2834 fps	•••
•••	3.598"	24.0"	2882 fps	•••

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