New Granite Mountain Arms 550 Magnum Left-hand Now Completed

JD Noblin

JD Noblin

AH veteran
Joined
May 22, 2021
Messages
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Location
Oklahoma City, OK
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28
Hunted
Zimbabwe, Tanzania, South Africa (Natal, Kalahari Desert, Limpopo, Free State), England, Australia, South America, Canada (New Foundland, British Columbia)
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 picture is of the 550 Magnum next to a 458 Lott....quite the difference.
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Very well done - beautiful rifle! Love the color case work. This is similar to my .500 Jeffery that Matt Roberts just finished for me on a GMA action. I'll be using CEB for softs and solids too. Already getting good results with the 570 grain flat nose solids and H4350.

Only shot up to .500 Jeffery and .505 Gibbs but have been intrigued by the .550 Magnum for a while. Let us know how it performs!
 
Even the timing on the screws is well executed. Absolutely beautiful craftsmanship.

22lpi Checkering from the looks of it?
 
That’s a beautiful rifle. Congrats. Do you have any hunts planned for it coming up?
 
Beautiful .550 Magnum, 28-Bore Nitro Express.
Smithson mounts are wonderful.

From an old MidwayUSA ad for the defunct Jamison brass:

The .550 Magnum, developed by Raymond Neal Shirley, does not fit the norm of a wildcat cartridge, which is a variation on an existing cartridge in an established bore-size. There hasn't been a rifle made with a .550-inch bore since the advent of smokeless powder. The .550 Magnum's parent case could be considered to be the .460 Weatherby Magnum. The design of the .550 Magnum was developed alongside the CZ 550 Rifle as a complete project. The rifle was developed by Michael Scherz, who worked with Neal in the development of the new platform. The .550 Magnum was designed with a few things in mind; low chamber pressure and as much power to fit in a magnum action rifle. These two traits are essential for an excellent African Safari hunt for dangerous game in hot environments. A conservative load fires a 700 grain projectile at 2,150 ft/s, generating 7,200 ft-lbs ME. Reloading supplies are ready available from many different manufacturers.

All specifications represent maximum dimensions.
Specifications:
  • Rim Thickness 0.0630"
  • Rim Diameter 0.5790"
  • Extractor Groove 0.4950"
  • Case Length 3.000"
 
Last edited:
That turned out nicely. I really like the stock work. Curious to see some targets when you get it going. What is the weight of it?
 
JD Noblin said:
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 picture is of the 550 Magnum next to a 458 Lott....quite the difference.
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Click to expand...
That is buauty.
Krish
 
That wood stock.... just love the "smoke and honey" look. :E Drooling:

Pretty interesting cartridge as well.
 
cmk said:
That wood stock.... just love the "smoke and honey" look. :E Drooling:

Pretty interesting cartridge as well.
Click to expand...
Cartridge is awesome. I still have not gotten around to loading the 650 gr. Raptors, but can’t imagine anything other than devastating.
 
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