Load data for .300 Win. Mag. + 150gr Hornady ECX

596 suitable loads across 103 powder(s) for cartridge .300 Win. Mag. with 150gr Hornady ECX bullet.

The most recommended powders for this combination are ReloadSwiss RS 60, Alliant Reloder-16 and ReloadSwiss RS 70.

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.

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 | ECX

Cartridge:.300 Win. Mag. load data

Case Length (L3):2.620" | 66.5 mm

Cartridge Length (COL/L6):•••

Seated Depth:0.523" | 13.3 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:1:13.0

Get PRO license to unlock all data and calculators

Community Loads for .300 Win. Mag. + 150gr Hornady ECX

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)

64.9 gr	3.290"	24.0"	3153 fps	•••

77.5 gr	3.290"	24.0"	3251 fps	•••

63.6 gr	3.291"	21.3"	2841 fps	•••
•••	3.291"	21.3"	2995 fps	•••

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