10mm SOCOM (pic)

Pablo · February 24 2016 06:03:12 PM MST

AR-15? Why not an AR-10 platform?

erdyalx · February 24 2016 07:00:54 PM MST

I read an article many years ago where someone necked down the 450 Marlin to use various muzzle loader bullets. I think it was hornady that has a good selection of .40 muzzleloader bullets.

The_Shadow · February 24 2016 07:33:51 PM MST

Pablo, the 10mm SOCOM, like the 375 SOCOM are based off the 458 SOCOM cartridge. These have a rebated casehead rim the same size as 308/45ACP, the casing has high volume, based off the 50 Beowulf, which changes some across the various offerings. The cartridge for these were being loaded to 2.260" limitation of an AR magazines. Various bullet designs and nose profiles do require some changes the COAL to fit the chamber as cut.

Recently the 458 SOCOM was being considered as being adopted and legitimized by SAAMI.

Hopefully Mr. Rumore will share his loading data for the 10mm SOCOM to add some measure of safety for those who seek to work with this cartridge. He has been very straight forth sharing his spreadsheets for the 40Super data with me in the past,
so I have to thank him for his generosity. ${$default_cheesy_smiley}$ ${$default_cool_smiley}$

I have been loading the 458 SOCOM for my nephew, who has the Tromix 16" and 10" uppers. In doing so I have studied everything I could find for this cartridge and it does delive one hell of a wallop. It would be a fairly easy transition for me to move into the 10mm SOCOM, so I have to start a build for myself. ${$default_grin_smiley}$

oldman10mm · February 24 2016 07:57:17 PM MST

I reload many cartridges,one is the 35Rem rifle cartridge using 38/357 revolver bullets,9mm pistol bullets,and 380acp 90gr pistol bullets. I consider it my 'fun' shooter using that large cartridge to propel bullets that weren't designed for it. Paper targets never exhibited any unusual holes,so those handgun bullets held up to the velocity.

35Rem with Sierra 90gr 380acp bullet.

sgmtino · February 25 2016 08:43:55 AM MST

so if I have a di 10mm auto ar15 barrel can the gas port be plugged and it be rechambered for this I am intrigued

The_Shadow · February 25 2016 10:18:42 AM MST

NO, the BCG is that of 308 case head, the cartridge is the 458 SOCOM necked down which is fairly large diameter. Getting the locking lugs appropriate for the cartridge size maybe different.

sqlbullet · February 25 2016 10:46:54 AM MST

Quote from: sgmtino on February 25 2016 08:43:55 AM MST
so if I have a di 10mm auto ar15 barrel can the gas port be plugged and it be rechambered for this I am intrigued

If you have an AR-15 chambered in 10mm auto, then you have a starting point. You will need a 458 SOCOM bolt, and then you barrel reamed.

If it were me I would just build a dedicated upper for this. .400 barrel blank, have it turned and the barrel extension pinned. Then use it in what is otherwise a 458 socom upper build.

TonyRumore · February 25 2016 11:05:45 AM MST

I am quite surprised there is this much interest in the 10mm SOCOM. We never planned to make it a production item, but I guess we may need to rethink that.

Tony Rumore
Tromix

Rich10 · February 25 2016 11:37:54 AM MST

Quote from: TonyRumore on February 25 2016 11:05:45 AM MST
I am quite surprised there is this much interest in the 10mm SOCOM. We never planned to make it a production item, but I guess we may need to rethink that.

Tony Rumore
Tromix

I know at least three people who have checked Tromix site for sales info.

sqlbullet · February 25 2016 12:11:35 PM MST

Keep in mind we are not a random sample. Results in this forum will be skewed.

The_Shadow · February 25 2016 02:13:16 PM MST

Hey Mr. Tony Rumore, I linked this to the 458 group and Big Bore AR Group on facebook and it did stir some interest there as well. ${$default_wink_smiley}$ Some of them have been drooling and some are thinking what is Tony up too now... LOL ${$default_roll_eyes_smiley}$

The 458 SOCOM upper with the proper sized ejection window and cover is also needed for the ejection of the larger 458 brass and needed for the 10mm SOCOM and 375 SOCOM setups as well.

While in conversation with another fellow who has a 6.8 SPC that triggered a thought that the casehead of the 6.8 is the same as the 10mm, with that thought in mind I thought why not case form and neck them up to 40 cal. to make a 10mm magnum type cartridge for the AR. It may be easier to just use 10mm brass. ${$default_roll_eyes_smiley}$

sgmtino · February 25 2016 02:42:05 PM MST

i would so be down for 10mm bore cartridge in ar platform I have a qc10 glock lower with a Ron Williams barrel still working on feeding issues but would not think twice about changing over to a higher case capacity and using standard ar mags

Not_A_SEAL · February 25 2016 02:59:12 PM MST

Yeah... I don't want my second post here to be the proverbial flash bang thrown into the room but I gotta know... "Why?" And, why do people insist on associating the "SOCOM" moniker with wildcat rounds? Because I don't recall ANY release coming out of the associated program office seeking sources or requesting info for a quasi pistol rifle round.

And let's be honest. The 458 SOCOM was NEVER adopted by ANYONE in SOCOM.

Yeah yeah, someone talked to someone and that someone was affiliated with a SOCOM unit and blah blah blah. But it isn't based off a formal requirement. There's no government program attached to any of this generating an ICD/CDD to be routed to the SOCOM BoD or JCIDS process.

So, is this akin to a redneck saying "hold my beer and watch this" i.e.; "hey I gotta cool idea"?

Because if it is, why attach the "SOCOM" branding? Is it because it sounds cool? If so, why not call it the "10mm Trident" and talk about how it came about after a conversation with some guys over beers at Boneshakers in Dam Neck ? Lol.

And before someone spouts off that every round in use started as a wildcat" as an argument, remember, those rounds, to include the 6.8 and 300 Blackout were associated to a requirement, not a discussion with dudes in a bar who don't generate requirements lol.

I will concede that it's a nifty toy for those who have disposable liquid assets but there's ZERO applicability beyond that.

So, "why"?

Not_A_SEAL · February 25 2016 03:12:49 PM MST

And unless your counter argument contains can reference at a minimum a USON, 9 Line that has KSA. KPP and a PSPEC with thresholds and objectives, don't say anything because I'll just embarrass you and you'll be forced to ban me to make yourself feel better.

The_Shadow · February 25 2016 04:43:25 PM MST

Not_A_SEAL, we are an open minded group, that share a 10mm following mostly. But understand we like to discuss everything 10mm and yes other cartridges and calibers. This post (10mm SOCOM) started by Tony Rumore who is a respected gunsmith, machinist and design innovator has brought his development concept here knowing we would like to see his work and hear of his progress. If he wishes to label this one a SOCOM, I think he has that right seeing he is the person who is designing the cartridge based on the original SOCOM cartridge design.

As far as the 458 SOCOM story, it was said that there was a need for a heavy duty round with special purposes, you can read and study that even more here https://en.wikipedia.org/wiki/.458_SOCOM

You mention a lot of various acronyms of which I would have to look up to better understand, but it doesn't lend any credence to the project. But we do try to maintain a respectable forum here!