This cartridge sounds interesting but I know nothing about it. Is there a parent case for this cartridge or is it its own case? What is bullet diameter, velocity and available bullet weights? Also, who manufactures brass?

It's big, bad, and would kill alien motherships.probably some guys here who have one.

Seamus the cartridge has interested me and my mate enough that we are having one each built. From what I have read on this cartridge it is the .577 nitro case with the .505 gibbs rebated rim on it. Woodleigh make projectiles for it in weights of 650 grains and 750 grains as stadard and 900 grains available on special order. Full power loads can acheive 2500 fps with a 750 grain bullet. We are having ours built on 602 Brno's, this is stretching the limits of these actions but it has been done and was designed to be able to fit into an m 98 action. The case length is 2.85" long and case capacity is around 160 grains. I am personally thinking of sticking to using 650 grain bullets to keep recoil manageable and not to have scope/mount problems as I have purchased a 2.5x20 leupold for it. Brass is an issue and the only manufacturer of it is Bertram Brass. It is so soft and this causes problems, hopefully one day a better brass manufactuerer will pick up production by special order. I got the idea of this cartridge from the blokes on this forum who own one. I am putting a 26" Tobler stainless barrel on mine as well as a Kevlar/carbon fibre reinforced fibreglass stock, mounts are warne fixed. I will post pictures when it is finished, but I am still waiting for my dies and reamer before the project can be started. Hope this helps, I hope you are interested enough to build one to.

Regards PC.

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I believe Ross Seyfried was the one to develop this round.

The word (as I understand it) NYATI is the KiSwahili (I believe) for Cape Buffalo. I think I would've used MBOGO; again KiSwahili. As I understand the meaning of this word is also Cape Buffalo but one that has become very dangerous such as having been wounded. Someone feel free to correct me, but this is just out of memory from reading.

coon

I know someone has posted Seyfrieds article on the round, so you should run a search on the forum for 585 Nyati, and you'll find it.

Anyhow, Ross wanted to use his 577 NE for backup work, but didn't want to take such a valuable rifle to Africa, so envisioned a bolt action version of the 577 NE.

He took the 577 NE case, rebated the rim, shortened it to 2.8" and blew the case out nearly straight for form a small shoulder. The design parameters were a .585" 750 gr bullet @ 2150 fps, which is what the 577 NE achieves. The Nyati has been loaded to 2500 fps, but recoil is in a class of its own.

It's a hopped up version of the 577 NE designed for a bolt gun. Properly designed and executed recoil isn't that fierce, but ammo is a problem. It's an interesting toy. Stay tune for my REALLY BIG GUN WACKOUT COMPARO -Rob

The 577 NE pushes a 750 grain bullet at 2050 fps, not 2150 fps.

The 585 nyati can push a 750 grain bullet to 2550 fps if you choose to do so.

quote:

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Originally posted by coon:
I believe Ross Seyfried was the one to develop this round.

The word (as I understand it) NYATI is the KiSwahili (I believe) for Cape Buffalo. I think I would've used MBOGO; again KiSwahili. As I understand the meaning of this word is also Cape Buffalo but one that has become very dangerous such as having been wounded. Someone feel free to correct me, but this is just out of memory from reading.

coon

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Hi coon,
I like your thinking.
470 Mbogo

PC,
How much is it costing you total to build your .585?

Seamus here is a break down of what I have spent in Aus$.

Brno 602 .375- $820 CZ's (new are $1250)

Barrel stainless 26" tobler $550 aprox

Dies,trim & file, press bushing deburring tool. $608

Reamer-$500

scope-$435

Mounts-$110

Chambering feeding etc. ???? is not done yet.

Stock-$924.

I hate writing down what I have spent it makes me feel sick in the stomach

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470M,

Aren't you glad that Seyfried didn't use Mbogo? 470 Mbogo rolls off the tongue way better than 585 Mbogo would have.

Canuck

Frank Wells has written about a similar cartridge also based on the 577 nitro case with the rim turned down called the .586 Wells - it must be almost identical. Out of academic interest, probably the only cartridge that was designed by one of my countrymen, the .577 Rewa was a .600 NE necked down to .577 if I remember right. Does anyone have any info on this? Thanks.

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Mehul Kamdar