6.8 SPC questions

[tfr270]

I'm bored. I'm injured and sitting at home since I can't go to work. So, what do I do? I start thinking about an AR. I'm on the internet surfing around and checking stuff out. All kinds of questions...anyone else here think AR-15.com is laid out weird?

Anyway, I see that new caliber, 6.8 SPC, being offerred in various AR's. I do a little digging and find out it's close to a .270, one of my favorite calibers. So, what is the deal? Do any of you have any first hand knowledge/experience with this caliber? Is it going to be the new thing for the military? Price and availibility ok? Sounds good to me...I can put this rifle in a scabbard in the jeep and deer hunt, shoot pigs and coyotes, have enough firepower just in case I run into growers and need to put out rounds while high tailing out of there. Seems like a nice all around caliber to have in an AR platform. I'm looking at a Stag Model 5 which seems like a nice EBR that I'd enjoy shooting.

[kilopaparomeo]

It's not really a new caliber as it has been out since at least 2003 or 2004.

The bullet is a .270 caliber and most loadings are 90-115 gr that will do 3000-2650 fps in those weights.  You occasionally see heavy bullet loads at 130 gr but I don't think that is the sweet spot for the caliber.  The case is based off the old .30 Remington.  While some people try to make it into a .270 Winchester "lite"....it really isn't.  It is a good solid intermediate round that has better terminal ballistics capability than the 5.56.  It's closest competitor is the 6.5 Grendel...the Grendel is a better round beyond 300 yards and many would say that the Grendel is the same as the SPC inside 300 yards.

No it is very unlikely that the caliber will be the new military round.  In fact, I'd say there it is extremely unlikely that the military will select a new round anytime soon...more likely to keep incrementally improving the 5.56x45mm.

As you've probably read, it was developed with the help of some SOCOM guys and Remington had the first chamberings.  The round has gone through some growing pain but it seems to have worked out now.  The original SAAMI chamber specs were too tight and the old 1:9 and 1:10 twists were too fast.  Gave too high pressures.  The new SpecII chambering is better with the longer leade and 4 groove 1:11 twist barrels allow hotter  loads (like the SSA Combat Loads).  Remington still puts a large rifle primer in the round but everyone else is putting small primers.  I use Starline brass myself.

I load my own 6.8 with Sierra, Hornady and Barnes bullets in the 90-110 gr range.  H322 and Varget give the best results for me.

I think the 6.8 SPC will survive...it is being well supported by gun and ammo manufacturers.  It is a decent round.  It won't have the proplarity of a .30-06 or 5.56, but it will likely have a small but dedicated following for some time.

Here's my 6.8 SPC that I built about 3 years ago.  I've been very happy with it and would not feel undergunned against any 2 legged predator and would confidently take any game that I would otherwise use a .30-30.



6.8 SPC AR build

• AeroPrecision Multi-caliber lower
• Stag/CMT M4 upper
• Badger Gen II TacLatch
• RRA 2-stage NM trigger
• VLTOR eMod stock
• WOA 18" SS SPR profile barrel and bolt
• PWS FSC30 flash hider / comp
• YHM front sight
• Brownells HK-type rear sight
• ERGO grip
• Magpul triggerguard
• MI low profile gas block
• YHM FF rifle-length quad rail handguard
• MI sling mounts
• EoTech 511 (soon to be swapped out for a 1-4x Millett DMS-1)
• PRI mags
• Now it also wears a CAA VFG and Surefire weapon light

[Pathfinder]

^^^^^ What he said!!   

I have a Stag 6.8 upper I run (currently) on a DPMS lower. A more noticeable bark, but if there is more recoil I can't feel it.

Biggest issue is ammo. I was lucky and got some right before the world went nuts and bho got elected. What little ammo I have seen on the shelves locally was Hornady at $40 for 20 rounds. Three out of 4 local stores have not had any for a while. Midway seems to be out, SSA has some - or so they say.

Brass is expensive if you reload - and if you can even find it, but yes, any low-weight .270 bullet should be OK for reloading. IIRC, the round is a .30 Rem necked down to 6.8mm/.270. I have an assortment of Hornady, Speer, and Sierra bullets set aside for when I ever get around to reloading myself. Like KPR mentioned, if you reload, Note that Rem brass takes a large rifle primer, and the SSA brass takes the small! Go figure!!

[Fatman]

Path, the 6.8 upper fits on a 5.56 lower, yes?  How about the Grendel? I'm guessing yes, probably really close in cartridge size.

[tfr270]

Beat me to it Fatman...I was wondering the same thing. Thanks Kilo and Path!That is a nice rifle you have there.
 

[Sponsor]

[Pathfinder]

The 6.8 and the Grendel - and Beowolf IIRC work on the 5.56 lower. Oddly enough, so do the bolt-action .50BMG uppers, although obviously not the semi-auto types.

I went with the 6.8 mainly because I was not interested in supporting the litigious and proprietary Grendel.

BTW - mags are generally available, even if the ammo ain't. C-Products makes some nice ones and they're not that expensive either.

[kilopaparomeo]

Yup, the AR lower has been made into a lot of stuff.  In this pic is a .50 BMG, 5.56, 6.8, .22LR and 9mm.  I've had a 6.5 Grendel in the past but sold it.

[alfsauve]

Given the 5.56/.223 case the 6.8SPC is a good choice for the AR-15.

However, if you go with an AR-10, then you have a wider field of higher powered cartridges to chose from:  .243, .260, 7mm-08, .308 and .338Fed. 

Just an option to think about.

Of course everyone should have both and AR15 and an AR10 lower, right?

Alf

just working on my second AR-15 build out. 

[Solus]

Since we have this topic going, I'll ask a question I have been considering.

I happen to have an Olympic upper and lower I acquired in the early 90s.  The upper is stripped but the lower seems to have all the parts, but I'm not experienced enough to say it has them all. 

I have wanted to so SOMETHING with it for some time now.

I haven't heard much good about Olympic so my question is:  Should I try to build a 6.8 (or some other variant) on this lower and upper or are they not up to the job?

Thanks.

[ericire12]

Yup, the AR lower has been made into a lot of stuff.  In this pic is a .50 BMG, 5.56, 6.8, .22LR and 9mm.  I've had a 6.5 Grendel in the past but sold it.

I hate BillT kilopaparomeo 


*I think at some point you have enough guns.... redistribute.... social justice.... etc etc