550 Magnum - WTB Brass/Projectiles

[whisk(e)y hunter]

Anyone have any brass, projectiles, or loaded ammo for the 550 Magnum (based off 460 WBY)?

 

[AustinM]

@krish , I think I remember you have a 550 magnum or 3. Do you have any leads on the above?

 

[RR 314]

Anyone have any brass, projectiles, or loaded ammo for the 550 Magnum (based off 460 WBY)?

Man, I think I cornered the market on the stuff when I panicked after buying mine. Where are you located? I may be able to spare some.

 

[RR 314]

Man, I think I cornered the market on the stuff when I panicked after buying mine. Where are you located? I may be able to spare some.

And you may want to check with @JD Noblin as I know he sold some in the past.

 

[krish]

@krish , I think I remember you have a 550 magnum or 3. Do you have any leads on the above?

There is on in GB LISTED RIGHT NOW. 2 DAYS TO GO. RUNNING AT $7500 +.
WATCHING IT.
KRISH

 

[krish]

Anyone have any brass, projectiles, or loaded ammo for the 550 Magnum (based off 460 WBY)?

Is that you bidding on one in GB ? If you are I will back off
KRISH

 

[whisk(e)y hunter]

Quite gentlemanly Krish, I’m tapped out on it and going to make one separately from a CZ 550 action, but really appreciate the offer.

Now you need to buy it!

 

[whisk(e)y hunter]

PS if anyone gets a message from @Buckle6 he is a SCAMMER!!!

 

[Daniel Cary]

.. Please! .. share some light on this cartridge!!!

Not buying, but want to see this thing....

 

[whisk(e)y hunter]

Here’s a post from one of our members @JD Noblin on his rifle, an incredible build. Essentially a straightwalled 460 WBY that shoots a 700 grain .550 monster projectile

Thread 'New Granite Mountain Arms 550 Magnum Left-hand Now Completed'

Mar 18, 2025

For your viewing pleasure, my gunsmith just completed this full custom left-hand rifle for a client of mine. It's chambered in the massive 550 Magnum and utilizes a Granite Mountain Arms African Magnum action. In addition to the two heavy cross bolts and recoil lug under the front bridge, a custom third recoil lug is attached to the barrel and secured through the stock forearm with an escutcheon and screw. The barrel is Pac-Nor, 30mm QD rings by Smithson, and Turnbull completed the color case work. Solids and softs for this rifle are from Cutting Edge Bullets. For comparison, the last...

• JD Noblin
• Replies: 15
• Forum: Firearms & ammunition

• 
• 

Another great account from PH Jason van Aarde at

https://www.**NOT**PERMITTED**.com/550-magnum-season-3.html

 

[whisk(e)y hunter]

I had intended to do a 505 Gibbs conversion, but through a lot of research and thought, and guidance from minds much more experienced than me, the 550 Mag looked be a much more straightforward process to still achieve 5-bore status from the venerable CZ 550.

 

[Daniel Cary]

I emailed the seller. @krish , etc.

"Does anyone know if this was done by 'Tripple River"? .. And Barrel length?

Thank you, Dan.

 

[RR 314]

For what it is worth, I have one from AHR that is awesome. However, I likely wont use it as I have a superior .450 Rigby I have fallen in lust with. .550 with a lifetime of loaded ammo and components. Not for sale, but can be purchased.

 

[Daniel Cary]

For what it is worth, I have one from AHR that is awesome. However, I likely wont use it as I have a superior .450 Rigby I have fallen in lust with. .550 with a lifetime of loaded ammo and components. Not for sale, but can be purchased.

It is stunning! .. if we can see it, once more?

If you care to share

 

[cajunchefray]

It is stunning! .. if we can see it, once more?

If you care to share

I find it interesting how some wildcat a cartridge to greater than .500 Jeffery ( I really liked the cartridge, it didn’t like me) recoil was a bit much for me to be consistently accurate after 3 rounds.
Is the development of +.500 bore rifles from unfortunate experiences in the jess on elephant, or just because a better idea?
I never discount a better idea.

 

[krish]

Quite gentlemanly Krish, I’m tapped out on it and going to make one separately from a CZ 550 action, but really appreciate the offer.

Now you need to buy it!

I put a bid on it, but gitswith gun bidding high on it. Girls with gun is a dealar. I have bought some f t om them before.
Krish

 

[Big_Easy]

I emailed the seller. @krish , etc.

"Does anyone know if this was done by 'Tripple River"? .. And Barrel length?

Thank you, Dan.

Should be...It sold previously at auction earlier this year.

CZ Model 550 Safari Classics Bolt Action Rifle in .550 Magnum

CZ Model 550 Safari Classics Bolt Action Rifle in .550 Magnum with BoxWith matching factory box hand marked as being a 2019 SCI donation rifle.

www.rockislandauction.com

 

[Daniel Cary]

Ty @Big_Easy "Rock Island" CZ custom shop, "Tripple River" assuming.

1.8K views · 41 reactions | My lady shooting my .550 Magnum for the third time in a row. 700 grain at 2240 ft/s. all shots went into one hole at 20 paces. | 550 Magnum

My lady shooting my .550 Magnum for the third time in a row. 700 grain at 2240 ft/s. all shots went into one hole at 20 paces..

www.facebook.com

 

[Daniel Cary]

I'm intrigued.

What an investment CZ's turned out to be.


550 Magnum.

 

[JD Noblin]

I have built two 550 Magnums for clients using Granite Mountain Arms African Magnum actions and am now building a third one for myself. The only company that was making 550 Magnum head-stamped brass was RCC but it is unfortunately out of business now. Every now and then you will see head-stamped brass from Jamison. Quality Cartridge Company claims it makes 550 Magnum brass but the website always says "Next run when sufficient back-order exists". I have personally given up on Quality Cartridge Company for supplying anything custom as I've had an order in for 6.5x68 brass now for well over 5 years.

For projectiles, Hawk Bullets makes softs...but I am personally concerned about their bullets not holding together on dangerous game like cape buffalo, hippo, etc. I currently have some Hawk bullets but will only use them for practice and the occasional rabid squirrel charge. Cutting Edge Bullets makes a flat-nose soft and solid....but those projectiles will not feed 100% reliably in the GMA African Magnum action (this is where the CZ550 action has the advantage over the GMA due to different feed ramp geometry and positioning of the feed rails).

In my experience, the only projectiles that will feed with 100% reliability in the GMA action are spire points and round nose projectiles. For solids, I just purchased 1500 700gr round nose solids from Barnes Bullets who made them for me on a custom order. For softs, I am currently talking with Northern Precision Custom Bullets about making some 700gr round nose bonded projectiles with thick jackets.

The Bames projectiles are slated to be delivered to me October 10th. I will only be keeping about 500 of them. Anyone who wants to buy some can PM me.