.458 SOCOM 18.6" AR-15 barrel order- gauging interest

Scotty454

Scotty454

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I've been emailing back and forth with Zach from True North Arms about getting a NR length (18.6") .458 SOCOM AR barrel in. 11/16" 24TPI muzzle thread. He estimated cost for 1 stainless match barrel at $499 CAD. 2-5 month lead time.

He mentioned that cost would be lower if a multiple piece order was placed, so I figured I'd see if anyone here would be interested. He said he wouldn't do a pre-order as the are many uncertainties with manufacturing and import; didn't want to disappoint anyone. So he'd rather just place an order if there's enough interest, and then just put them up for regular sale when they come in.

Anyone interested? Build a big thumper for your SLR or Modern Sporter :D
 
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Magmalis said:
I am definitely interested. What about the bolt head or complete bolt carrier also? It is different than the .223 right?
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Yup, base is quite a bit bigger than .223. TNA sells .458 bolts I think, and then you can just buy whatever carrier.

Zach said they could also bring in bolts and brakes. Could probably work that out if they if go ahead with a barrel order.
 
I am on the fence between the 458socom and the 450bushmaster for an ar build any particular reason to choose socom vs bushmaster?

Thanks
 
Spcamno said:
I am on the fence between the 458socom and the 450bushmaster for an ar build any particular reason to choose socom vs bushmaster?

Thanks
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I went with bushmaster based on the availability of legal 5rnd magazines and choices of available ammunition in Canada. When I did mine there was only Remington and Hornady, now there is also winchester, federal and some other smaller companies. Remington is also going to be releasing some different bullets and weights later this year. Socom is basically reload only right now and for the foreseeable future
 
G.Mitchell said:
Bullet selection is the big difference I think.

Believe .458 Socom uses rifle bullets where .450 Bushmaster uses pistol bullets.

I am interested in a .458 Socom build too.
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The loadings out there from companies I already mentioned above are rifle loadings as this caliber has taken off because of hunting regulations in the USA which allow it to be used in a shotgun season unlike the 458
 
Not interested myself but that's because I already have a .458 Socom build and I would highly recommend it! Large selection of jacketed bullets available and you can cast your own from one of the many .458 diameter molds that are out there. My own cast hand loads run great in semi-auto, lots of fun! Nothing like the kick from a super hot load with 325gr Hornady FTX bullets or a softer load sending 400gr lead bullets down range in semi-auto! The .458 Socom also uses standard 5.56 magazines, so if you have some 10 round XCR-L magazines you can fit 4 rounds of Socom in there!

I would be interested in a brake as well as a thread protector as that is what I am missing since the thread for the Socom is scarce here.
 
Spcamno said:
I am on the fence between the 458socom and the 450bushmaster for an ar build any particular reason to choose socom vs bushmaster?

Thanks
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I may be wrong, but it seems that 450 bushmaster stuff is more available relatively to each other, but they are both expensive to play with. You can size 458 socom projectiles to 450 bushmaster, but you cant go the other way around. 458 seems to be more expensive in general and is listed under specialty brass on starline's website. Keep in mind that the effective range on both of these calibers are under 300 yards, if you want something that has greater reach its better to go with an AR-10 platform you can get much more powerful cartridges on the AR-10 for the price you'd be paying for less if not equal and ammo is widely available especially if you don't reload.

Personally I'd be in for a 450 if my SLR ever comes in
 
PhantomAR said:
I may be wrong, but it seems that 450 bushmaster stuff is more available relatively to each other, but they are both expensive to play with. You can size 458 socom projectiles to 450 bushmaster, but you cant go the other way around. 458 seems to be more expensive in general and is listed under specialty brass on starline's website. Keep in mind that the effective range on both of these calibers are under 300 yards, if you want something that has greater reach its better to go with an AR-10 platform you can get much more powerful cartridges on the AR-10 for the price you'd be paying for less if not equal and ammo is widely available especially if you don't reload.

Personally I'd be in for a 450 if my SLR ever comes in
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Greater reach is subjective, 223 can be pushed well past 300yds but it is for paper, not animals at those distances.

The rem 30ar is the highest performing round on game that can be stuffed into an AR15 size action (I have done it). It also has 5 different loadings available from remington.

I am actually surprised people will do a 458, or beo when it is virtually reload only in comparison
 
.458 SOCOM uses the same bullet diameter as .45-70. Plenty of bullet options exist. Not a lot of factory ammo, but I intend to reload for it.

The main factor that swayed me towards the .458 is the case design; it's a bottleneck vs a straight wall with the .450 bushmaster. You're really pushing the AR-15 bolt capacity with such a large cartridge (not much material left under the lugs), and I would think that a bottleneck cartridge would be less prone to headspace issues, and the resulting potential overpressure if it's not right.

.450 BM bolt face:

products-8448501-450_Bolt-Face.png
 
Scotty454 said:
.458 SOCOM uses the same bullet diameter as .45-70. Plenty of bullet options exist. Not a lot of factory ammo, but I intend to reload for it.

The main factor that swayed me towards the .458 is the case design; it's a bottleneck vs a straight wall with the .450 bushmaster. You're really pushing the AR-15 bolt capacity with such a large cartridge (not much material left under the lugs), and I would think that a bottleneck cartridge would be less prone to headspace issues, and the resulting potential overpressure if it's not right.

.450 BM bolt face:

products-8448501-450_Bolt-Face.png
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The 458 and 450 have the same rim diameter?, they also run similar psi on factory loading. If you load it hot you are asking for it without running a stronger bolt from AR performance or having one made from a stronger alloy.

Either caliber runs around 38,000psi. My 30rar is factory loaded to 55,000psi and was proof tested with an additional 20% over charge. The custom bolt held up fine and so did the rest of the rifle. And that is with a .492 rim vs the .473 of the 458/450
 
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