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Post by AxeHandle on May 2, 2019 6:48:50 GMT -5
I see Ruger ARs in 450 and S&W ARs in 458... We all know the proper answer is "BOTH." Perhaps a better question will be which to buy first.
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Aggie01
.375 Atomic
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Posts: 1,769
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Post by Aggie01 on May 2, 2019 7:08:11 GMT -5
I just had this discussion with myself. I picked .458 SOCOM. Literally put the barrel on the upper last Friday.
Still no dies and brass, but I had this .458 upper sitting around.
My biggest interest in the round is big bullets trundling along at just under the speed of sound, in short barrel, with a can on the end.
To that end:
The .458 headspaces on the shoulder, vs the case mouth like the 450 Bushmaster. I felt a little more confident with being able to crimp 450g+ bullets in the SOCOM.
The .458 has a little more case capacity. .458 has a better selection of 400g+ bullets.
Most .450 Bushmaster barrels are 1:16 or even 1:20 twist.
The standard .458 twist is 1:14. It better stabilizes the big subsonic slugs. Tony at Tromix led me to the 12" 1:14 instead of the 10" 1:10 twist for shoooting the 450g plus slugs subsonic.
Buy your barrel and bolt from Tromix & craft your own. Use Lancer magazines.
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Post by bigbrowndog on May 2, 2019 10:26:47 GMT -5
The Socom will spit bullets out faster than some can take it,.....older 300gr. HP’s. A contract shooter I use for feral hog abatement was using them and they would come apart and provide dramatic results on coyotes and pigs less than 100#, but not much penetration.
His favorite all around use projectile is the Barnes TTSX,.......the Socom is a gas operated 45-70, if you so desire........they do deflate pigs with authority.
Trapr
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Post by AxeHandle on May 3, 2019 6:24:05 GMT -5
 Had not thought about that headspacing thing. Always thought the .458 bullet selection would be better. Starline wants a few more bucks for brass for the SOCOM but I'm now thinking that will be first.
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Post by AxeHandle on May 3, 2019 6:25:41 GMT -5
What butt stock are we running? I'm thinking the current M4 style might not be the best for this much recoil.
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Post by bigbrowndog on May 3, 2019 9:36:19 GMT -5
An adjustable gas block would help with recoil and BCG speed.
Trapr
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Post by uncletom on May 3, 2019 11:30:17 GMT -5
I will second the recommendation of dealing with Tony at Tromix. I have a 12" pistol and a 16" rifle assembled from Tromix parts, both .458 Socom and no issues with either. I have played with bullets from 300gr to 525gr. Imr 4198 seems to work well for me. A buddy is happy with Lil Gun as his powder of choice. Berry's makes a 350gr plated bullet for low cost plinking loads. I would also recommend getting the Redding dies and a case gauge to help eliminate any variables in the reloading process.
Pistol is running a sig brace, rifle has an Ace skeleton stock. Heavy loads in the rifle are not punishing, but 525's at 1050 in the pistol get my attention pretty well.
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Post by AxeHandle on May 4, 2019 17:21:18 GMT -5
Literature is leading me to believe that the 458 runs out of standard 556 magazines. True? False?
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Post by matt56 on May 4, 2019 17:52:13 GMT -5
True. I guy I work with built one. If I were going to build an AR I would go with the .458
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Post by uncletom on May 4, 2019 18:28:43 GMT -5
I have had zero issues feeding from unmodified milsurp mags or lancer mags. I have read that Pmags do not work, but have no first hand experience with them.
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Post by shphntr on May 4, 2019 19:50:54 GMT -5
Socom is the way to go. Lots of bullets to choose from. Put a decent recoil pad on it and have some fun. Mine is on a RRA upper and I have not had any issues.
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Post by sportster on May 6, 2019 19:20:56 GMT -5
I put a 458 together, still haven't shot it. Been over a year now. My brother deer hunts with his.
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Post by AxeHandle on May 9, 2019 6:26:46 GMT -5
Bought 458 SOCOM dies and shell holder this week... Added a Lee crimp die to the set. Thinking it will fit in the Hornady box with the other dies. Found a rifle with a Rock River upper I can afford. I like RR stuff.. Still need brass. Starline is my friend.  |
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Post by jimtx on May 9, 2019 19:29:59 GMT -5
I was going to build a 458 a few years ago but go biggest or go home I built a 50 Beowulf instead. Alexander Arms upper it was nice but I was having major shoulder issues and ended up with 5 hours of surgery so I sold it before a single round was fired. I have been thinking about building another 50 or 458 but might go with 458 to use standard mags I have instead of modifying them or buying proprietary mags.
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Post by cas on May 9, 2019 19:47:27 GMT -5
My 50 Beowulf worked fine with slightly tweaked GI mags. IIRC I just spread the lips a little up front to get the noses up a smidgen higher.
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Had not thought about that headspacing thing. Always thought the .458 bullet selection would be better. Starline wants a few more bucks for brass for the SOCOM but I'm now thinking that will be first. 
