.585 Nyati

[Alaskan454]

This thread has been a great read, my Dad got into 500 and 416 Krieghoff doubles recently and I thought the 500 NE was big medicine. It's a plinker compared to the Nyati!

[Sarge]

Put a Limbsaver Nitro pad on that puppy. I socked one on a 30-06 and was back to full loads less than 90 days after an extensive shoulder rebuild.

www.thesixgunjournal.net/the-winchester-670-short-rifle-project/

[larry4831]

Aug 25, 2015 1:52:48 GMT -5 whiterabbit said:

Aug 20, 2015 19:18:53 GMT -5 Lee Martin said:

Hard recoiling rifles abuse the shooter way more than even the largest handguns. Unlike a revolver there isn’t 3 feet of air between you and the gun. Yes, your wrists and hands take punishment but do so under travel. With a rifle it all lands on your shoulder and face. And your wrists still get wrenched. It may surprise you but I’d rather shoot my .50 Alaskan BFR than our Alaskan Siamese Mauser. Fifty rounds of 585 grs @ 2,000 fps and I return with a headache and sore shoulder. The same holds for a .500 Maximum Ruger from the bench. I’ll take that any day over my .450 Ackley on bags.

We’ll be cautious with the Nyati though. If I’m going to launch 750 gr Woodleighs to 2,500 fps it’ll happen with a brake, mercury reduction, a sling, and 12 pounds of mass. On a lighter note I also designed an 840 gr cast with Mountain Molds. Plain base and out of lino it should do well at say 1,700 fps.

-Lee
www.singleactions.com
"Chasing perfection five shots at a time"

Lee, It is gonna be a sweetheart. My 510 wells does 850 grain cast bullets at 1900 fps as a reduced load and it's all I can stand. Also 12 pound rifle, mercury recoil reducer, but no brake. Also, I weigh 145 lb and 6'3". operative term is "stick thin". 1700 fps is a walk in the park, and 1500 fps feels like a lightweight shotgun.

2500 fps will be brutal I am sure! But with a brake, knowing what the wells is like, it's gonna be a sweetheart with ANY load. Including those woodleighs!

Brake off, you couldn't pay me to shoot a 750 grainer doing 2500. Brake on? No problem. Sign me up! I have no doubts there will little if any special considerations needed once the brake is spun on.

Can't wait to see the rifle.

[larry4831]

I had a 378 Weatherby Magnum which I used to shoot quite a bit. Over the couple years that I shot it I started to get some pain in my right shoulder and just thought maybe I had injured it somehow. Had some x-rays done and a MRI I found that I have torn ligaments five bone chips and severe arthritis in the right shoulder. I now have to have surgery done but I wish I had Been little bit smarter when I was young. At that time I was young and tough and just because I didn't feel a lot of pain I didn't think I was doing any damage. I have not had surgery yet and I do still shoot but now iPad up, that's like closing the barn door after the cows you're gone .

[Sarge]

Mar 20, 2016 17:25:44 GMT -5 larry4831 said:

I had a 378 Weatherby Magnum which I used to shoot quite a bit. Over the couple years that I shot it I started to get some pain in my right shoulder and just thought maybe I had injured it somehow. Had some x-rays done and a MRI I found that I have torn ligaments five bone chips and severe arthritis in the right shoulder. I now have to have surgery done but I wish I had Been little bit smarter when I was young. At that time I was young and tough and just because I didn't feel a lot of pain I didn't think I was doing any damage. I have not had surgery yet and I do still shoot but now iPad up, that's like closing the barn door after the cows you're gone .

Mister, you've been reading my mail.

My shoulder wreckage was a result of being way too strong for my size, lifting way too much in my youth and 30 years of fighting big mean drunks and carrying one end of a litter with people 300-600 pounds on it. The good news is that they can do amazing things with shoulders these days my right shoulder is now as good as it was 20 years ago. Good thing the rest of me is feeling my age, or I might do it all over again

[kings6]

Careful Sarge you are in the perfect storm stage. It all feels good as new and fixed up and the next thing you know it is torn up again. Like my buddy the surgeon who has worked on my shoulders and forearm 4 times now, it isn't the muscle mass giving out as we get older but stay in shape, it is the connective tissues that lose their elasticity and become the weakest link. Staying strong just kind of fights the situation rather than helping it.

Each repair results in a new normal and failing to recognize that is the factor in the next repair.

[Quick Draw McGraw]

Lee, I'd like to reiterate that you are indeed crazy. And I'd also like to reiterate that it's awesome! Can't wait to read more about this build, it's very exciting stuff!

[Lee Martin]

Pushing this project back to the top. I got side-tracked with bullet swaging but we're now set to barrel this Nyati. We inspected the action on Sunday and it turns out the inlet is 2mm metric. Fortunately we have a big Nordic lathe by South Bend that'll thread metric. The feed rails don't need much relief but the bolt face will take some cutting. Unlike others I refuse to rebate the rims to Rigby diameter. I've heard too many stories about cycling headaches when you go that route.

I also just ordered three hundred Woodleigh 750 grain bonded weldcores and 100 Barnes 750 gr solids. More to follow.

-Lee
www.singleactions.com
"Chasing perfection five shots at a time"

[cmillard]

cant wait!!

[whiterabbit]

Wow, didn't realize the Nyati was larger than rigby sized. That's clearly quite a case you have. I wonder if a 500 Jeffery may then have similar issues, as it is a (smaller) case with a similar shape? Regardless, I too am enjoying the progress reports as they come.

Curious, do you have a brake design? are you just going with a standard brake design, simply opened to 58 cal?

Since you were working on swaging previously, any plans to swage 1/2" copper pipe into bullets for the monster?

[Lee Martin]

We’re going to make our own muzzle brake out of stainless. It’ll basically be a copy of the Ross Schuler design shown below:



I also referenced the bolt face in my earlier post. This CZ is set-up for a Rigby head, which is 0.590” on the rim and body. The Nyati wears a 0.640” rim and a 0.662” web. The extra girth necessitates grinding the bolt lips and extractor. The areas that’ll be relieved are highlighted here:



Outer edges will be pretty thin, as in 0.030” but it’ll work. CZ does the same on their 0.700” bolt with the .505 Gibbs. 0.750” bolts are ideal for 0.640” rims but those actions are expensive. Granite Mountain makes such a receiver and they list for over $3,000. There’s no need to spend that sort of loot however. CZ 550 Safaris are more than adequate as evidenced by the many Nyatis and Overkills built on the platform.

-Lee
www.singleactions.com
"Chasing perfection five shots at a time"

[whiterabbit]

I appreciate the time you take to not only write up the work, but the thought process behind it and the decision making process you execute to make those choices. For those of us who like to deep-dive into living vicariously through your project, it's an extra level of enjoyment.

So, thanks for that.

(you're making my 510 wells on a CZ550 project from a couple years ago feel really, really small now!)

I don't know if you mentioned it earlier, but what muzzle OD are you going with? I went with .960 on mine and am quite satisfied with that decision (no brake on my rifle). I assume you are going to be at least an inch so you have some room to turn the muzzle down for the thread OD? 

[coloradoyaler]

Lee

This is the 585 Nyati I owned. It was number two that SSK built. It utilized the same case head as the 460 weatherby. I bought bertarm basic 585 Nyati brass. I had a gunsmith make a lathe cutting tool to recut the heads. It worked great. I had no trouble with the brass and I could easily get 2400fps with the 750gr barnes and Woodleigh bullets. I personally would rather turn the heads of the cases than make the bolt rim too thin. Especially when you have access to your lathe and own tooling! I had 50 cases made up and reloaded 10 of then about 20 times and never did have a problem with the brass. Just a thought and opinion.

Regards
Mark

[Lee Martin]

Nice looking Nyati you have there. And I’m glad you’re pleased with Bertram brass. Rumor has it 2,300 – 2,400 fps with a 750 gr gives sticky extraction. Yet you’re the third person I know that has gone 2,400+ and claims the shells work fine. I’ll probably stay 2,100 – 2,200 with jacketed bullets and 1,600 – 1,700 with my 840 gr cast. But I’ll run a few 750’s to peak. I’m curious to see if I can duplicate Ross’ 2,500 mark. Now as for the bolt, I’m going to leave the rims unaltered. No doubt it can be made to function. Your Weatherby proves that. It’s just that rebated cartridges are a hair tougher on the action mods; mostly around the feed rails and follower.

The Woodleighs also just came in and they’re big.







The Barnes banded solids should arrive any day now. Photos to follow.

-Lee
www.singleactions.com
"Chasing perfection five shots at a time"

[2 Dogs]

Says Lee, "The Woodleighs also just came in and they’re big."

Ya' think??