585 Nyati
Historical Notes:
With available muzzle energy exceeding 10,000 foot pounds of energy, the 585
Nyati deserves mention as very likely the world's most powerful shoulder gun
cartridge. The 50 BMG cartridge is used for sporting purposes and it generates
vastly more power than the 585, launching bullets of the same weight 300 fps to
400 fps faster. However, the 50 BMG is not by any stretch of the imagination, a
shoulder firearm cartridge. The 585 is.
This cartridge was created by Ross Seyfried by modifying 577 Nitro cases.
Besides from forming, the rim has to be turned down to fit the bolt face. Either
standard belted magnum or 416 Rigby rim size is used as the bolt requires.
Length allows chambering in magnum Mauser actions with minimal modifications.
Modified magazine capacity is three cartridges. Seyfried reports very
satisfactory accuracy, no doubt a result of careful chambering and quality
workmanship throughout the rifle and load. Nyati (n-ya-te) means Cape buffalo in
several African languages and this is certainly a good name for a cartridge
delivering so much bullet and energy.
General Comments:
The 585 give those who really want power a much more affordable option, compared
to the big British double rifles which can often demand tens of thousands of
dollars. However, one must mention recoil. It is an open question as to how many
among us can tolerate the kind of recoil this cartridge will generate with full
power loads. In a 10 pound rifle with a good muzzlebreak, top loads will
generate a mere 20 foot pound. Perhaps a better understanding of what this means
is this: Imagine having this 10 pound rifle dropped off a 32 foot cliff and
catching it with your shoulder. Bullets for the 585 are available from Barnes,
Woodliegh, and numerous custom manufacturers. This caliber also performs
superbly with pure lead cast bullets.
Source: Cartridges of the World
| 585 Nyati Reloading Data | ||||
|---|---|---|---|---|
| Bullet (grs.) | Powder / (grs.) | MV | ME | * Recoil |
| 650 Barnes TC Solid | 4350 / 160.0 | 2402 | 8330 | 112 |
| 750 Barnes | IMR-4350 / 130.0 | 1925 | 6175 | 92 |
| 750 Barnes | IMR-4350 / 140.0 | 2040 | 6935 | 104 |
| 750 Woodliegh | IMR-4350 / 140.0 | 2196 | 8035 | 118 |
| 750 Barnes Solid | IMR-4350 / 140.0 | 2210 | 8135 | 119 |
| 750 Barnes | IMR-4350 / 150.0 | 2287 | 8715 | 129 |
| 750 Barnes | IMR-4350 / 160.0 | 2487 | 10,300 | 152 |
| 750 Barnes | RL-15 / 120.0 | 2070 | 7140 | 102 |
| 750 Barnes | RL-15 / 130.0 | 2235 | 8320 | 119 |
| 750 Barnes | RL-15 / 140.0 | 2420 | 9755 | 139 |
| 750 Barnes | RL-15 / Max | 2525 | 10,620 | 151 |
| 545 Lead Patched | 4198 / 72.0 | 1641 | 3255 | 34 |
| 650 Lead Patched | 4198 / 73.0 | 1660 | 3975 | 48 |
| * In a 10 pound rifle with vented barrel. | ||||
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