The .585 Nyati is a shoulder-fired rifle cartridge

Cartridge (firearms)

A cartridge, also called a round, packages the bullet, gunpowder and primer into a single metallic case precisely made to fit the firing chamber of a firearm. The primer is a small charge of impact-sensitive chemical that may be located at the center of the case head or at its rim . Electrically...

. Nyati (n-ya-te) means Cape Buffalo in many African languages such as Swahili

Swahili language

Swahili or Kiswahili is a Bantu language spoken by various ethnic groups that inhabit several large stretches of the Mozambique Channel coastline from northern Kenya to northern Mozambique, including the Comoro Islands. It is also spoken by ethnic minority groups in Somalia...

. The .585 Nyati can generate 10000 ft-lb (13,558 N·m) of muzzle energy. This places it at or near the top of the list for most powerful cartridges that can be chambered in a rifle that can still be carried afield.

History

The .585 Nyati was developed by Ross Seyfried. He was motivated by the desire to create a rifle with tremendous stopping power at a fraction of the cost of expensive double guns such as the various Nitro Express

Nitro Express

The Nitro Express series of cartridges are used in large-bore hunting rifles, also known as elephant guns or express rifles. They are named after the propellant they use, cordite, which is composed of nitrocellulose and nitroglycerine...

 rounds.

The rims were turned from .577 Nitro brass and the case blown out straight to allow formation of enough of a shoulder for headspace purposes. Brass formed by this method, during the developmental phase, had a relatively weak case head because the parent .577 Nitro case was designed for a double rifle which supports the case head all the way to the rim. In a bolt action rifle, a portion of the case head is unsupported and requires more strength in that area.