The .300 Remington Short Action Ultra Mag
By Chuck Hawks
The .300 SAUM is based on radically shortened version of the Remington .300 Ultra Mag case. Like the full length Ultra Mag cartridges, the .300 SAUM is a beltless bottleneck case with a rebated rim (a rim smaller in diameter than the case body).
Remington offers factory loads with three bullet weights (150, 165 and 180 grains) for the .300 SAUM. With a 150 grain Pointed Soft Point (PSP) Core-Lokt Ultra bullet Remington claims a muzzle velocity (MV) of 3200 fps and muzzle energy (ME) of 3410 ft. lbs. The 200 yard figures are 2622 fps and 2290 ft. lbs.
With a 165 grain PSP Core-Lokt bullet Remington claims a MV of 3075 fps and ME of 3464 ft. lbs. The 200 yard figures are 2527 fps and 2339 ft. lbs.
For the popular 180 grain Nosler Partition bullet Remington claims a muzzle velocity of 2960 fps with 3501 ft. lbs. of muzzle energy. The 200 yard figures are 2571 fps and 2642 ft. lbs.
Reloaders will find that the .300 SAUM prefers medium-slow burning powders and bullets of 150 grains or heavier. Good powder choices include H4350, IMR 4350, IMR 4064, and W 760.
Here are some specifications of interest to reloaders: bullet diameter .308", maximum COL 2.825", maximum case length 2.015".
The fifth edition of the Nosler Reloading Guide shows that their 150 grain bullets can be driven to a MV of 3024 fps by 61.0 grains of IMR 4350 powder. A maximum load of 65.0 grains of the same powder gave a MV of 3208 fps.
The fifth edition of the Nosler Reloading Guide also shows that their 180 grain bullets can be driven to a MV of 2712 fps by 58.5 grains of IMR 4350 powder, and 2952 fps by a maximum load of 62.5 grains of IMR 4350. These Nosler loads used Remington brass and Rem. 9 1/2 primers, and velocity was measured in a 24" barrel.
Note: A full length article about the .300 Remington Short Action Ultra Mag can be found on the Rifle Cartridge Page.
Copyright 2004, 2012 by Chuck Hawks. All rights reserved.