Jack Lott designed the 458 Lott Ammo. He had an adverse encounter in Mozambique with a buffalo where he suffered some injuries. This incident made him believe that ammo more powerful than the 458 Winchester ammo he was hunting with was vital for dangerous games. He wanted ammo that could drive a 510-grain bullet at 2150 fps at moderate muzzle pressure. When he couldn’t find one that fit the bill, he chose to design one of his own.
The designs of the 458 Lott Ammo were on a paper diner napkin. The plan maintained most of the features of the .458 Winchester Magnum. However, he solved the case capacity issue by extending the case length from 2500 inches to 2850 inches. However, during experimentation, the case ended up at 2800 inches. With the new case capacity, the .458 Lott could drive a 500-grain bullet to a muzzle velocity of 2300 fps and 2570 foot-pounds energy.
The .458 Lott Ammo can also achieve a muzzle velocity of 2150 fps with a 600-grain bullet. This performance is far higher than that of the .458 Winchester it replaces. It also provides superior penetration, which makes it an excellent fit for hunting dangerous games. It also features a tapered case that offers exceptional flexibility in reloading to lower muzzle velocities.
The ability to reload to a lower velocity provides shooters with ammunition that has less recoil. Therefore, the .458 Lott Ammo is versatile because it works well for hunting small to medium games and is also a perfect fit when you’re hunting dangerous games like the African Buffalo and Alaskan brown bear.
The 450 Rigby, sometimes known as the 450 Rigby Magnum Rimless, is a rimless, bottlenecked cartridge with a caliber of.45 caliber (11.6 mm) designed for hunting big hazardous wildlife. The cartridge is based on a.416 Rigby that has been necked up to take a.458-inch (11.6 mm) bullet. The cartridge is designed for magazine rifles and is not to be confused with Rigby's.450 Nitro Express, which was released in 1898.
The CIP regulates and regulates the.450 Rigby dimensions and specifications. A bore diameter of 11.43 millimeters (0.450 in) and a groove diameter of 11.63 millimeters are recommended by the CIP (0.458 in). The barrel will feature a six-groove rifling profile with a twist rate of one revolution per 420 mm (17 in) and a groove width of 3.60 mm (0.142 in). Maximum pressure of 4,000 bar is specified by CIP (58,000 psi).
The 450 Rigby, unlike many modern.458 caliber dangerous game cartridges, was designed to run at lower pressures. The maximum pressure restriction imposed by CIP is 4,000 bar (58,000 psi). With the 500-grain (32 g) bullet, the cartridge readily reaches the target 2,300–2,400 ft/s (700–730 m/s) at these pressures. In tropical settings, where the cartridge is designed for usage, the lower pressures enable improved operating dependability. With the 500 gr (32 g) cartridge, the 450 Rigby easily approaches the coveted 2,400 ft/s (730 m/s) velocity record while staying well within the CIP pressure limitations.
The 450 Rigby was created with the intention of hunting large, thick-skinned dangerous game animals in Africa. Due to the cartridge's performance, it would be a superior cartridge for certain game animals, such as African elephants, Cape buffalo, rhinoceros, and maybe hippopotamus, than the standard standby cartridges.
