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View Full Version : 6.8 SPC or .458 SoCom Conversion


Ron-Solo
04-21-2012, 12:40 AM
I have several AR rifles chambered in 5.56 and was thinking about converting one to 6.8 SPC.

Anyone have thoughts on the 6.8 round?

I'm undecided on whether to just get a complete upper or rebarreling a current upper and a new BCG. Opinions?

I'm just starting to research, but thought I'd learn from others experiences.

I thought about .458 Socom since I have lots of 30 round AR mags, but the ammo is a little expensive. Opinions?

This build isn't for hunting or any special purpose. Just want to do something different. Plus, you never know about zombies. :D

Thanks!

Droppin Deuces
04-21-2012, 12:57 AM
6.5 Grendel.

MrPlink
04-21-2012, 1:14 AM
300blk, more commonality with std parts, just a dif barrel

451040
04-21-2012, 2:41 AM
This build isn't for hunting or any special purpose. Just want to do something different.

Stating the obvious ... .458 SOCOM is more different than 6.8 SPC.

KillZone45
04-21-2012, 2:44 AM
6.8! Thats a no brainer

shadowofnight
04-21-2012, 7:31 AM
The first time you squeeze off a 458 Socom round, thats when you will know how different it is. :)

Being a huge 45-70 fan, getting a 458 Socom upper was a must for me...and it didnt disappoint in the least.

I would steer clear of both the 6.8 and the 458 if you plan on shooting either of them a lot , and you are not a reloader...but if you are a reloader you have to choose if you want more long range energy or shorter range major thump.

The last 2 guys that shot my 458 , bought big bore AR's...one another 458 and the other a 50 Beowulf. They are worth the price of admission.

usaf_yz426
04-21-2012, 8:41 AM
I'm in the same boat, the kid in me wants the .50 beowulf, for the obvious reasons. But the logical person in me says to get the 300blk, for $ reasons.

alfred1222
04-21-2012, 10:58 AM
6.8, Thats your best choice IMO

ElvenSoul
04-21-2012, 11:11 AM
Just step up to a AR10ish and enjoy. Cost just a little more than a 6.8 these days.

Ron-Solo
04-21-2012, 10:56 PM
I see a lot of stuff on 300 BLK but it looks like it is 7.62x35, making it a smaller round than 7.62x39, and I already have several rifles in that cartridge.

An AR10 would require a different receiver, rather than using one of my existing receivers.

Does 6.8 require anything different than a barrel, BCG, and new mags? All the ARs I've built we're 5.56.

MrPlink
04-22-2012, 12:07 AM
300blk uses the same bullets as .308win which means it could actually be A LOT bigger than 7.62x39.

RogueSniper
04-22-2012, 12:16 AM
I see a lot of stuff on 300 BLK but it looks like it is 7.62x35, making it a smaller round than 7.62x39, and I already have several rifles in that cartridge.

An AR10 would require a different receiver, rather than using one of my existing receivers.

Does 6.8 require anything different than a barrel, BCG, and new mags? All the ARs I've built we're 5.56.

^^^ That's about it. I shoot my 6.8 from a 18" Noveske upper. My groups are <0.5" at 100yds. It still has some <thump>, but nothing like a .308. i reload with a 90gr Sierra, but I get the same results with S&B 110gr PTS.