The .350 Remington Magnum carries the same design as the 7mm Remington Magnum but is a shortened version. When it was introduced, it was the most powerful 35 caliber of its time. However, due to its short-fat concept in a time when longer and slender were preferred, it failed to captivate gun writers and shooters then. In short, many innovations around this cartridge and the rifle chambered for it were heavily scrutinized and criticized. The .350 Rem Mag was created by the Remington Arms Company in the year 1965, a year after the Model 600 carbine rifle, a push-feed bolt-action rifle by the same arms company was introduced. This cartridge was produced with two factory loads: a 200 grain and a 250 grain each at a velocity of 3000 fps and 2500 fps, respectively. The .35 caliber Rem Mag was a powerful cartridge, generating muzzle energy of up to 4000 ft. lbs.
In terms of performance, the cartridge had limited ability to use longer, heavier bullets with higher ballistic performance due to the magazine length of the rifles it is usually chambered in. The .350 Rem Mag was a handy rifle, making it a convenient brush gun. At a reasonable range, the .350 Remington Magnum could easily take on a dangerous game. However, reloading with certain bullets made the cartridge capable of 500 yards of big game hunting. However, this intense power came at the terrible cost of vicious recoil, making it difficult for the average man to take a shot with the rifle. Also, as the model 600 was made of light synthetic material, the bedding was always at risk of being destroyed by the enormous power of the .350 cartridge. The idea of a compact rifle which was accurate, long-reaching -boasting great power was what the model 600 and .350 Rem Mag hoped to achieve. Unfortunately, that was lost in translation, seeing the .350 Rem Mag factory loading discontinued.
The 376 Steyr rifle cartridge was developed in collaboration with Hornady Manufacturing, Steyr-Mannlicher, and Lt. Colonel Jeff Cooper's design philosophies for use in the Steyr Scout rifle. It was first released in 1999 and was designed specifically for as an African game legal cartridge. The 376 Steyr used a 9.364mm Brenneke case that had been necked up to receive a 0.375-inch (9.5 mm) bullet. To suit a normal length rifle action, the casing is additionally reduced by around 4 mm. The 376 Steyr was also chambered in the Steyr Prohunter rifle for a brief period, however this combination was abandoned.
Because the 376 Steyr is a long cartridge for a short action rifle, it can only be loaded in short action rifles with long (modified) magazines. When velocity is low in a medium bore, the performance window might be rather small. Most medium bore bullets perform admirably at impact speeds of 2200 feet per second. Shot location becomes increasingly critical between 2200 and 1800 frames per second. Bullet expansion can be poor below 1800fps. This style of load is ideal for hunting medium game in the bush or forests, since it allows for quick kills. When hunting extremely large game, however, the 376 Steyr has limits.
On heavy animals, a robust medium weight (250 grain) bullet might be the most efficient killer, but the hunter should not anticipate quick results. Kills can take more than a minute (often considerably longer) unless the hunter uses careful CNS shots, allowing large animal to move a lot of area before falling from blood loss.
