.458 socom


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OhioChief
June 20, 2011, 05:57 PM
Just finished my RRA .458. Oddly enough, the flash on the camera makes it look silver....it's not. Black as any other 'Black gun' I own. I think I'll end up building a different lower for it, but this was a good start. Anybody know how to modify the Mag's for those large rounds?

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Z-Michigan
June 20, 2011, 06:01 PM
Looks nice!

Anybody know how to modify the Mag's for those large rounds?

I thought half the point of 458 SOCOM was that it worked in 100% unmodified standard AR-15 magazines, same follower and everything.

OhioChief
June 20, 2011, 06:09 PM
Nope. I'm pretty sure you need to trim off a little of the feed lips (lack of understanding of the proper terms). They load well, but the second round won't feed. I'll have to do some research. RRA should have it on their site, but I thought I'd ask while posting a pic.

Z-Michigan
June 20, 2011, 06:27 PM
I don't own one, but the company that set this standard says you can use unmodified magazines:

http://www.teppojutsu.com/458.htm

I would try another brand/model of magazine before you start modifying the feedlips.

OhioChief
June 20, 2011, 06:36 PM
SBR site says the same thing. I read a while back that you had to do something to the mag, and I know for sure that the 2 I've tried didn't work. But I agree, I will keep researching before making any modifications. Thanks

1858
June 20, 2011, 06:46 PM
I thought half the point of 458 SOCOM was that it worked in 100% unmodified standard AR-15 magazines, same follower and everything.

Me too. I've been trying to decide if I want to put a .458 SOCOM or .450 Bushmaster on a spare BM lower and the magazine issue had me leaning towards the .458. I'll have to follow this thread very closely.

lobo9er
June 20, 2011, 06:49 PM
450 uses unmodified mags too i am pretty sure.

lobo9er
June 20, 2011, 06:50 PM
Ammo pretty easy to get for this guy?

OhioChief
June 20, 2011, 06:57 PM
There's a .458 forum as it turns out. Those guys all claim no mods needed, but mostly went with Lancer L5 mags. So that's what I'll do.

Ammo. Well of course it's not cheap, but I get it mailed from SBR. 20 rounds goes for $60.

1858
June 20, 2011, 07:18 PM
450 uses unmodified mags too i am pretty sure.

Based on what I've read, the .450 BM uses a different follower in 5.56 magazines.

Robert
June 20, 2011, 08:53 PM
20 rounds goes for $60.
Time to buy a press and start reloading.

lobo9er
June 20, 2011, 09:56 PM
Based on what I've read, the .450 BM uses a different follower in 5.56 magazines.

I think your right

Sam Cade
June 20, 2011, 10:09 PM
WHy do you have the rear sight so far forward...and backwards?

spartand003
June 20, 2011, 10:56 PM
20 rounds for 60 bucks. o_O

Man, I wish I could afford that.

OhioChief
June 21, 2011, 01:15 AM
Sam, the far forward I can explain because that just seemed comfortable. Now, Backwards, well that just gave me a good laugh. Never even noticed it. Turns out it works just fine that way...egg on my face. I just changed it.

Sam Cade
June 21, 2011, 01:31 AM
Sam, the far forward I can explain because that just seemed comfortable.

Kinda hard to get a proper sight picture with the aperture that far away aint it?

OhioChief
June 21, 2011, 01:35 AM
Well I'll move it back and try it. They are further back on my other guns, so you're probably right.

Mako_44
June 25, 2011, 12:34 AM
Ohiochief,
The distance from the eye to the aperture is the magic behind that type of sight. If you have another AR or have a friend that has one. get a tape measure and sight down the alternate rifle, have someone measure from your nose to the sight.

Now set your RRA to the same distance.

~Mako

jerkface11
June 25, 2011, 01:22 AM
Time to buy a press and start reloading.

It's a pity the brass is always backordered and that the parent case is even more rare.

OhioChief
June 25, 2011, 01:40 PM
I have a couple presses, just haven't purchased the dies yet. I've got so many projects going that I'm not sure that's making my 10 budget item just yet, but it will. I agree, everytime I look at brass, and even much of the desired ammo, it's back ordered. Thankfully it's not meant to be a "plinker".

Mako_44
June 25, 2011, 05:11 PM
SBR has Brass in stock.

300 rounds for $241.40 that includes the $14.60 for shipping. That's cheaper than buying it directly from Starline. SBR sells it in 100 round increments and Starline has a minimum of 250 rounds.

http://www.sbrammunition.com/brass.html

~Mako

OhioChief
June 25, 2011, 06:37 PM
Great. I'll jump on that right now. Thanks!

atomchaser
June 26, 2011, 08:58 AM
You may have to modify the Mags if you are shooting some of the longer rounds. I had to remove some metal on my mags with my dremel to feed the 500 gr rounds.

OhioChief
June 26, 2011, 11:02 AM
That may well have been my issue atom, I did have some longer rounds. I should have tried going to different ammo before I assumed that they just needed modified. I'm going to try a different mag, and a couple different types of ammo. Thanks

houlador
June 26, 2011, 11:14 AM
I dont remember the site, but I saw a dremel tool was used to "round out" or cut half circle into the front of the mag so the round is fed directly forward without any interferance. I am looking into the RRA upper as well. Thanks, Troy

atomchaser
June 27, 2011, 09:18 AM
I dont remember the site, but I saw a dremel tool was used to "round out" or cut half circle into the front of the mag so the round is fed directly forward without any interferance. I am looking into the RRA upper as well. Thanks, Troy

this is exactly what you do.

jmorris
June 27, 2011, 09:38 AM
I use stock mags with my 458, generally 20 round colt mags.

If you don't reload none of the big bore ar uppers are a good choice unless you don't care of ammo costs or don't shoot it.

feedthehogs
June 27, 2011, 08:07 PM
The heavier bullets and FP bullets can be an issue for feeding. All that is needed is to slightly bend the front 1/4 of the lips using a lip tool and not a pair of plyers to do it right.
This allows the round to sit nose high to clear the edge of the magazine. If you do it right, no need to dremel a magazine or bend the lips far enough that it can't be used with 5.56 ammo.

Some guys casting their own claim they have to dremel. Sounds to me as if they may be shooting 500 grn wad cutters. Casters are a breed of their own, breathed in too many lead fumes.

I've yet to have any issues except those on heavy bullets.

Marty's 458 socom forum has all the info you'll need to do this round up right.

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