.458>.300>.223???

patriot53 · Nov 30, 2014

Ok, tried searching this on the Web...found one young goofy kid on youtube, not completely getting what he was doing, but he sure seemed sure be into it?

I just want to know, if someone out there has, unfortunately accidentally tried this or purposely did, or just "knows"?

Could a .458 SOCOM "chamber" in a .300AAC BO. or .223 Wylde and "fire"?

Also, pretty sure the .300AAC could chamber in a 5.56 or .223 Wylde and fire...
...but not sure?
Just because it is the "parent-case" for the Blackout...not sure if it would fit & fire?
Anyone "know", for sure?

And, would the .223/5.56 would chamber in a .300Blackout rifle or is it too long?
Would it "fire"...shouldn't blow up anything in this case, the bullet is smaller than the bore?

Would the .300AAC & .223/5.56 chamber & "fire" in a .458 SOCOM gun?

primalmu · Nov 30, 2014

No chance that a .458 Socom could chamber in a .223/.300 Blackout chamber. The bullet diameter is larger than the base diameter of the .223/.300. By that same logic, there's no way a .223 or .300 Blackout would chamber in a .458 -- they would fall right out of the barrel since the bore is larger than the cases.

Not sure about the second and third questions, though.

KansasSasquatch · Nov 30, 2014

I dont know about .458, but a .300blk will chamber in a .223 if the bullet is seated to AR-15 magazine length. And it will destroy a barrel. Subsonic .300blk loads dont seem to do much other damage, but I bet a supersonic load would....I havent seen any pics of that particular situation though. I THINK a .223 cartridge would be too long to chamber in a .300blk, but I dont KNOW.

patriot53 · Nov 30, 2014

KansasSasquatch said:
I dont know about .458, but a .300blk will chamber in a .223 if the bullet is seated to AR-15 magazine length. And it will destroy a barrel. Subsonic .300blk loads dont seem to do much other damage, but I bet a supersonic load would....I havent seen any pics of that particular situation though. I THINK a .223 cartridge would be too long to chamber in a .300blk, but I dont KNOW.

So i'm thinking, that if that is the case ( no pun intended)...then keeping mags separate, or not even bringing both a .300AAC & 5.56 or .223 Wylde to the range together may be a good policy...if not myself, someone else I shoot with could screw up?

Zach S · Nov 30, 2014

I dont know anything about 458 socom...

I googled this last night while dealing with my insomnia... A .300BLK will fit in a .223 chamber. It is not pretty if its fired.

Frome what I've read, the longer subsonic loads wont chamber without a good smack (or two) on the forward assist. The ones I came across on google ruined the bolt and barrel, with the blowout going through magazine. One pic showed a cutaway of a .30 bullet squezzed into a .224 bore, and oddly enough, that pic showed up in my FB newsfeed today.

Shorter, supersonic loads will feed and fire if one errant round ends up in a magazine of 5.56. The ones I saw pretty much ruined the complete upper. Bulged or split chamber, mangled bolt, cracked carrier, bulged and/or broken upper...

Another_Kelley · Nov 30, 2014

Also, pretty sure the .300AAC could chamber in a 5.56 or .223 Wylde and fire...
...but not sure?
Just because it is the "parent-case" for the Blackout...not sure if it would fit & fire?
Anyone "know", for sure?

Gtscotty · Nov 30, 2014

That picture is worth at least a thousand words.

patriot53 · Nov 30, 2014

another_kelley said:

yikes...!

jmorris · Nov 30, 2014

The 458 socom also has a different bolt, the case head is the same size as a .308/45 acp.

The fact that a 300 will chamber and fire in a 223 is one of its biggest drawbacks, IMO.

patriot53 · Nov 30, 2014

jmorris said:
The 458 socom also has a different bolt, the case head is the same size as a .308/45 acp.

The fact that a 300 will chamber and fire in a 223 is one of its biggest drawbacks, IMO.

Just curious...not part of my OP, but how would the 6.8SPC figure in...
could it chamber & fire in a .223 Wylde upper, which was what I was considering to go with my Wilson .458SOCOM, "on-order"...along with another, .300AAC upper?
Does the 6.8SPC round fit into a standard 5.56 mag...I know they make "specific proprietary" mags, both 6.8SPC & now those new... :uhoh:

6.8SPC II Magpul / LWRC ones ( kinda reminds me of VHS vs. Beta video tape wars, we, over 30, know how that worked out...

)

Had a custom Pelican "type" case for the 2 uppers, and the Rifle broken down upper & lower... for days at the range checking loads worked up from
125 gr. bullets up to .600 gr. ; .300Blackout - .458SOCOM.
Volume target shooting with the 20" Wylde & bushels of 5.56/.223...
...call it a "day"

crazysccrmd · Nov 30, 2014

A 6.8 will not chamber in a 5.56 rifle, I don't know about the 458. You can load a couple rounds of 6.8 in a 5.56 magazine before it starts to bulge and not work right. Proper 6.8 magazines are steel to be strong enough to not bulge with different internal design. If you get a 6.8 get the right magazines.

If you want to keep calibers easily separated use different magazines. Black Pmags for 458, tan Pmags for 300, green Pmags for 5.56, steel mags for 6.8, etc.

Also, 6.8SPC II is not specific to the LWRC variant, the LWRC Six8 is chambered for the SPC II as has nearly every 6.8 on the market for a few years.

jmorris · Nov 30, 2014

The little tab in pmags have to be cut off for 458 socom to work. If you want to use 458 in an untouched .223 mag use standard GI mags.

patriot53 · Dec 1, 2014

crazysccrmd said:
A 6.8 will not chamber in a 5.56 rifle, I don't know about the 458. You can load a couple rounds of 6.8 in a 5.56 magazine before it starts to bulge and not work right. Proper 6.8 magazines are steel to be strong enough to not bulge with different internal design. If you get a 6.8 get the right magazines.

If you want to keep calibers easily separated use different magazines. Black Pmags for 458, tan Pmags for 300, green Pmags for 5.56, steel mags for 6.8, etc.

Also, 6.8SPC II is not specific to the LWRC variant, the LWRC Six8 is chambered for the SPC II as has nearly every 6.8 on the market for a few years.

But isn't the LWRC Six8 the one that has proprietary Pmags that only fit it's mag well?

crazysccrmd · Dec 1, 2014

patriot53 said:
But isn't the LWRC Six8 the one that has proprietary Pmags that only fit it's mag well?

Yes, but Six8 Pmags and 6.8SPC II are not the same thing. The 6.8SPC II is a chamber spec developed to make the 6.8 actually work since the original SAAMI spec submitted by Remington sucked. The Six8 is a lengthened magwell design to accommodate the Pmags specified for the foreign contracts.

.458>.300>.223???

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