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LukeinNZ
.224 member

Reged: 07/10/04
Posts: 30

585 Nyati on Ruger RSM??
#79404 - 26/05/07 07:44 AM

Marrakai is responsible for a lot on this forum!!! All this talk about his 577 2 3/4" light nitro express has always made me dream for a 577 cal rifle.
Now I have a Ruger RSM in 375HH sitting in the cabinet. Lets say I take Marrakais advice and go the 577 route and rebarrel the Ruger to 585 Nyati then regulate the express sights for his preferred load of 650gr woodleigh at 1850fps.
Stupid idea??? I don't need it...just want one!! A relatively low recoiling 577 cal rifle would be a whole lot of fun.
How well will the Ruger handle the Nyati round? Will the large case capacity be a problem downloading to 1850fps????
Talk some sense into me please.

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475Guy
.400 member

Reged: 22/08/03
Posts: 1088
Loc: Kali, US

Re: 585 Nyati on Ruger RSM?? [Re: LukeinNZ]
#79415 - 26/05/07 11:58 AM

It's probably doable. You may have to settle for a single stack magazine since the inside geometry seems a bit tight even for the 416Rigby and 458Lott rounds. Of course, you could have a new magazine box made for the staggered feeding if that's your goal. You'll probably have to have it restocked. Sounds very pricey to me.

--------------------
Lo do they call to me,
They bid me take my place among
them in the Halls of Valhalla,
Where the brave may live forever.

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500grains
.416 member

Reged: 16/02/04
Posts: 4732
Loc: Salt Lake City, Utah USA

Re: 585 Nyati on Ruger RSM?? [Re: 475Guy]
#79435 - 26/05/07 11:20 PM

There is no easy way to make a 585 nyati. Make sure to just a gunsmith who is an expert at getting big bore rebated rimmed cartridges to feed.

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600JDJ
.275 member

Reged: 22/04/04
Posts: 73
Loc: Iowa, USA

Re: 585 Nyati on Ruger RSM?? [Re: 500grains]
#79439 - 27/05/07 12:51 AM

Sound like a fun venture. You might talk to Ed @ AHR about one of his 585's or 600's. Maybe bigger than you think you want, but remember, you can always down-load the big one but you can't up-load the smaller one. Plus brass availability can be an issue. I make a light plinker for my 600 that uses an 800 gr flat nose over 70grs IMR-4198 with pillow fiber filler for 1500 fps. Low recoil, tremendous impact, very clean, accurate and only 20 fps variance in speed.

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LukeinNZ
.224 member

Reged: 07/10/04
Posts: 30

Re: 585 Nyati on Ruger RSM?? [Re: 600JDJ]
#79634 - 31/05/07 06:13 AM

Hey 600jdj,
I'm guessing the picture shown is a 600JDJ...impressive to say the least. What have you got that chambered in? I would think just about anything would expire very quickly when clobbered with that much lead. Just actually what I'm after!
When you talk about the 600 AHR is this the 600OK? Is there a website or good links on the Overkill. Maybe this is what i'm looking for. I liked the look of the Nyati because 577 cal bullets are readily available and Bertram Nyati brass should be easy to get. Maybe even the 550 Magnum might be the go. That way it is just weatherby brass straightened out.

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bigdog
.375 member

Reged: 05/02/06
Posts: 559
Loc: Southern Illinois

Re: 585 Nyati on Ruger RSM?? [Re: LukeinNZ]
#79638 - 31/05/07 07:51 AM

LukeinNZ, Do a search under American Hunting Rifles. Their site shows a 600 overkill. The 600 overkill can do a 900 grain bullet anywhere from 2000 ft/sec to almost 2400 ft/sec. And yes, Ed at AHR makes the 600 overkill. Less pressure and easier to feed than a 585 nyati, more power too!

--------------------
Kyle, I love you buddy, Dad

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600JDJ
.275 member

Reged: 22/04/04
Posts: 73
Loc: Iowa, USA

Re: 585 Nyati on Ruger RSM?? [Re: LukeinNZ]
#79793 - 02/06/07 09:32 PM

LukeinNZ
This 600JDJ is on a Ruger #1 that was built by SSK a few years back for me. It is a 577 nitro case blown out to .620 caliber. I am having AHR (American Hunting Rifle) now build me a 600 OK on a CZ action. Power-wise & case capacity is pretty close. The JDJ is a rimmed case and the OK is a belted case for a bolt action. Any of these 550's, 577's, or 600 will be killers in the extreme. The impact of these 620 caliber bullets on soft targets is something else

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LukeinNZ
.224 member

Reged: 07/10/04
Posts: 30

Re: 585 Nyati on Ruger RSM?? [Re: 600JDJ]
#79969 - 05/06/07 01:07 PM

Does the 600 OK use it's own propriety case or can this be made from another brass donor? I hadn't even thought about .620 cal - that's huge. If it could be done on easily sourced brass that could be the go. I can get Nyati brass from bertram or convert nitro brass that's why I liked the idea of 577 cal. Has any body looked at the 550 Magnum? Weatherby brass necked straight to 550 cal - easy to source brass...just a problem with the limited projectiles.

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Mike_McGuire
.333 member

Reged: 11/06/05
Posts: 348
Loc: Sydney Australia

Re: 585 Nyati on Ruger RSM?? [Re: LukeinNZ]
#79970 - 05/06/07 01:29 PM

Luke,

The 600OK is its own case. Kind of looks like a scaled up version of the 458 Win.

There are a couple of blokes in Melbourne that have 585 Nyatis on CZs and all is OK with the single stack magazines. One of them posts as PC on accuratereloading.com and Australian Hunting. They are using the 650 grain Woodleigh Black Powder Express bullet loaded to about 2300.

http://www.australianhunting.net/index.php

Another calibre that might interest you is the 500 A2. That is basically the 460 Wby necked up to 510. I think most people would agree that the 500 A Square offers the best combination of power and practicality.

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LukeinNZ
.224 member

Reged: 07/10/04
Posts: 30

Re: 585 Nyati on Ruger RSM?? [Re: Mike_McGuire]
#80144 - 08/06/07 10:46 AM

Yes the 500a2 looks like a neat cartridge. I think very versatile when you can load to say 500 nitro levels all the way up to full power loads if you want to loosen your teeth.
To be honest haven't even been on a biggame hunt yet. My rifles tend to visit the range or accompany me on hunting trips where goats, pigs and deer are the target. I'm in the planning in going hunting some wild scrub bulls in Wanganui here in NZ with my Ruger 375HH. There's alot of satisfaction that comes with owning and shooting exotic or obscenely fun rifles. Do I need a large calibre rifle...nope...I'm sure a 308 with 180gr pills would deal to wild bulls. I think like a lot of people the "just want one" factor happens a lot.
Would the 585 Nyati be any harder to get to feed than a 500 jeffrey? We have an excellent gunsmith in NZ by the name of Allen Carr who has build several 500 jeffs that I would have in mind for the project.

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LukeinNZ
.224 member

Reged: 07/10/04
Posts: 30

Re: 585 Nyati on Ruger RSM?? [Re: LukeinNZ]
#80146 - 08/06/07 10:49 AM

See www.ajcarr.co.nz for his website. The samples of his work I have seen are simply beautiful. He recently even built a 577 nitro express 3" on a ruger number 1.

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