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.300 H & H Mag. Load Data

Alternative names: .300 H & H Mag., .300 H&H Magnum, .300 Holland & Holland Magnum, .300 Super, .30 Super Belted Rimless Magnum

Our load data for caliber .300 H & H Mag. covers 571 bullets from 40 manufacturers and a total of 35973 load recipes. In addition, our members have shared 13 load recipes.

The .300 H&H Magnum is an incredibly powerful and versatile rifle cartridge, developed in 1925 for use in a variety of bolt action rifles. This round combines the velocity and energy of a magnum rifle cartridge with the accuracy of a high-grade precision rifle - making it perfect for both hunting dangerous game animals like bears, buffalos and other large predators as well as match shooting competitions.Offering excellent accuracy potential from quality rifles equipped with optics, this rifle round is capable of taking down even the largest game animals out to extended ranges while retaining sufficient power to penetrate through thick hides and bone. Its unique case design also allows it to be loaded with a variety of bullet weights ranging from 150 grains all the way up to 220 grains, giving shooters plenty of options when it comes to finding loads that work best for their specific application.

Caliber Statistics

Standard / Datasheet

Primer Size

Large Rifle Magnum (LRM)

Max. Case Length

85.9 Grains of Water

Bullet / Barrel Diameter

0.308'' | 7.82 mm

Max. Case Length

2.85'' | 72.39 mm

Max. Cartridge Length / OAL

3.6'' | 91.44 mm

Max. Standardized Pressure:

62366 psi | 4300 bar

XXL ID

CID_357

.300 H & H Mag. load data available is with the following bullets:

(most popular first)

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