Building .458 socom

[kbf64]

So are there any beefier parts you want for a .458 socom build? I noticed aeroprecision upper with a larger port: AR15 XL Stripped Upper Receiver - Anodized Black

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[titsonritz]

This thread has all links to info you need....
Build Thread - Building 458 socom


From the Tromix FAQ

Q: Which 458 SOCOM parts are different from 5.56 parts?
A: The only unique parts to the 458 SOCOM uppers are the barrel, bolt, upper receiver, and muzzle attachment.

 

[Xaevian]

A larger ejection port is necessary. Bolt needs to take .473" rim. Other than that, parts are the same but for the obvious like barrel and muzzle devices.

 

[Xaevian]

Dang you, Titz
...lol

 

[titsonritz]

Dang you, Titz
...lol

 

[titsonritz]

My job is done here.

 

[Xaevian]

You might appreciate an AR specific limb saver. I have one on mine, it's a pussycat, relatively speaking.

 

[kbf64]

Recoil much?

 

[Xaevian]

Like a big boy rifle, definitely more than the .556. A little less than a standard .45-70 (not a modern full load one) in my opinion. If you don't reload it can also knock your wallet right out of your pants. Ammo is pricey.

 

[james2562]

Research the limits/benefits of the cartridge. If you want big and bad: it fits the bill nicely. If you are looking for a 100-yd tack driver: not so much. If you are looking for something you can shoot completely suppressed and still drop a deer at 100-yd: it will perform.

It is a pricy platform. Effective cartridges are $3-$5 each. If you roll your own you can get the cost to $0.50 to $1.00 each. Then there is the cost of the can, can stamp, and SBR stamp if you want to be one of the cool kids.

If you move forward with the project get as much as you can from Tromix. Not only are you supporting the 458 SOCOM platform; if you look around you will find a lot of complaints/irregularities with other manufactures.

And yes it kicks.

 

[osprey]

Buy a large ejection port upper of your choice and a Tromix bolt/barrel combo and skip the reverse engineering headaches associated with lesser brands. Build it and they will come. Hands down the best subsonic hunting chambering in the ar15 platform.

 

[Capn Jack]

And yes it kicks.

More like a, "Boom" and a shove.
I use an, "Artillery Hold" when shooting off hand and ride with the shove.
You have to think of it as a shotgun and lean into it. My 12 ga. "Kicks".
Do your research on a scope. I went through 3 before I found one that held together.
Blue Loc-Tite is your friend.
I reload 325 gr. cast gas check bullets, (old SCUBA Diving weights) for about .35 a round.
Lots of good info here...http://458socomforums.com/

* I did put in an, "Oil Buffer" and I haven't shot out a scope since.

 

[osprey]

Here is my build thread

458 Socom upper build. I finally committed or should be committed

I have always reloaded and shot 45-70 but also have been intrigued by this AR chambering, so I finally did it. I have parts coming for a 458 Socom upper build. It will consist of an Anderson stripped 458 upper coupled to a stainless Tromix 16.25” barrel with a matched bolt. The rest of the parts...

www.northwestfirearms.com

 

[Xaevian]

I absolutely love mine. On the other hand, I find 5.56/.223 ARs rather boring and underwhelming. I handload .458 using Hornady/Speer JHP 300 grain bullets, Starline nickel plated brass, CCI large magnum pistol primers, and Hodgdon Li'l Gun powder. I get about 1850 FPS and they knock the crap out of steel gongs at 100 yards. I haven't used it on game yet, but wouldn't hesitate to out to about 150 yards.

 

[Dreadi]

I machined out the ejection port on standard 5.56 upper receiver for my 458 SOCOM. So if you have one already, that's an option you can consider if you're handy.

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[Capn Jack]

While most people choose to use an adjustable butt stocks on their .458S, I use a standard A2,
as I feel it helps to balance the heavy barrel.

* I guess I'm just not, "Tactical".