Thoughts on 6.8 SPC?

[Balog]

Keeps out the rif-raf that way. 

And they grandfathered you in?

[makattak]

Ok, bumping again as I have a follow up:

Does anyone have any experience with Stag Arms uppers?

[bedlamite]

The only issues with the Stag 6.8 are they do not have M4 feed ramps so you may have to add them yourself, and their muzzle threading is 1/2" instead of the standard 5/8", so be careful if you change the flash hider, a 5.56 hider will thread on and ruin your day in the process.

[IKIMURA]

I have a 6.8 from DPMS but I am having problems. It will not extract a unfired cartridge. I have to use a screwdriver to wedge the bolt open. I fired 10 rounds having to use the forward assist to lock the bolt. I reloaded that brass thinking it would now be fireformed, but it still gets stuck. I know its the rounds because I can cycle the bolt open and closed just fine with a empty chamber. I am using SSA ammo. I called DPMS and they said to try Remington ammo. Any thoughts?

IKIMURA

[bedlamite]

IKIMURA,  DPMS is one of the very few manufacturers that still uses SAAMI chambers, they are notoriously tight, even for a SAAMI chamber. Head over to http://68forums.com/ and talk to paulosantos, he has a reamer that will update your chamber to an SPCII.

[IKIMURA]

SOO you dont think its the ammo? If its the chamber I will let DPMS take care of it. Will they charge me?

[bedlamite]

Feel free to call them, but DPMS has their head in the sand. They will tell you the gun is not the problem. If you download this pdf file, you can see what difference the chamber and rifling twist rate will make, it can lower the pressure up to 10K psi. Then go register on http://68forums.com/ and contact Paul about reaming your chamber to what it should have been to begin with.

[Lennyjoe]

Are you neck sizing only when reloading?  I'd be reluctant to do so in that rifle.  I'd prefer to full size. 

[IKIMURA]

I full size my reloads. My brand new factory ammo will not work either!

[Bogie]

I got cornered by either Ferris or Lou (I'm not really sure which is which) at the last Supershoot, and he proceeded regale me with stories of the cartridge's superiority... Sounds like the greatest thing since sliced bread, but if it is blown-out toward straight, it'll have a tendency to extract hard. Polish the chamber.
 

[bedlamite]

Bogie, the parent case is the 30 Remington, basically a rimless 30-30 shortened and necked down. Base is .418", shoulder is .400" and 1.3" from the base.

[Gewehr98]

It's a modification of the old .30 Remington, same family as the .25 Remington and .32 Remington, as used in the Browning-Remington autoloading Model 8/81 rifles, and the pump 14/141 rifles.

They in turn were rimless ballistic clones of the .30 WCF and .32 Winchester Special, and loading data from the latter can be used for the former.

the 6.8 SPC still has a pronounced shoulder, so headspacing and extraction is really no problem. 

To fit into an AR-15/M16 length magwell, those .277 bullets have to be short, so you won't be able to run the high BC numbers like the Berger .277 VLD without intruding into powder capacity.

I wanted to build a 6.5 SPC wildcat, and run .264" high-BC bullets, but again the length and powder capacity limitations keep me in the lightweight bullet territory.

[IKIMURA]

I wrote DPMS a EMAIL and a guy named Matt from Quality said to send it in and he would ream it to SPCII for me. I guess DPMS has there act together. I will let you guys know how it shoots.

[Bogie]

FWIW, at the Supershoot and IBS Nationals last year, had a nice discussion with the Shilen boys... They're doing some good AR barrels...
 

[bedlamite]

Palmetto State Armory has C-Products 25 round 6.8 SPC magazines listed for $11.99 right now if anyone is interested.

http://www.palmettostatearmory.com/183.php