2 part question about the new 6.8mm SPC round?

Question

i have seen the new AR15 variants in the 6.8mm and was just wondering if anyone knew about this round...
1- how close is this round to the .270, are they equal like 5.56mm and .223?
2- could a 6.8mm SPC weapon shoot .270 ammo and vise versa?

Answer 1

the second part first no they are not the same round
the 6.8mm spc uses the 30 Remington as the parent brass
the 270 uses the 30/06 as the parent brass
so I would say that they are not interchangeable

the 6.8mm with a 115 gr bullet has a muzzle velocity of about 2800fps
the 270 with a 130gr bullet has a muzzle velocity of about 3100 fps
so the 6.8 is slower than the 270
I hope this helps

Answer 2

Except using the same bullet diameter, the two aren't very close, and they can't even remotely be interchanged. The "new" round has been around (sorry) for a few years now.
It's been well known for a long time that the ideal general-purpose military round should be something in the vicinity of 7mm caliber, bullet weight around 130 grains, muzzle velocity around 2400-2500 fps. The British were working on the idea when WW II broke out, and again in the fifties, when the US bullied them into the 7.62x51; and the Garand was headed that way when diverted to the overpowered 30-06.
You can't quite get that out of an M-16. The receiver's just not big enough to hold enough cartridge. But the guy who came up with the idea put as much into it (actually he was more interested in M4 carbines, as I understand it, but the receiver's the same), and used the obsolete Remington autoloader cartridge as his base. The 284 size didn't work as well as he hoped, so he used 277's.
The idea's sensible if (and only if) you limit yourself to the AR15 platform. You'd start your design with a head larger than .378" and smaller than .473", (the sizes of 5.56 and 7.62 NATO), and length also a compromise. That's where this thing sits. And of course it isn't a deer cartridge, but some people had to use it on deer anyway as soon as it came out.

Answer 3

It is nowhere near the .270 Win cartridge. The 6.8 mm SPC is based on an obsolete cartridge called the .30 Remington, which was the rimless version and Remington's answer to the 30-30 Win. As a matter of fact, both cartridges can be loaded using the same dies and re-loading data. Re #2; a long action, bolt action rifle MIGHT POSSIBLY be fitted with a separate bolt assembly and properly chambered barrel to make a switch bbl rifle but, in all practicality, NO it won't work. There is NO interchangability between the cartridges in the same weapon with on massive alterations.

Answer 4

Here is some good info on the 6.8mm SPC. BTW the 6.8mm SPC WILL NOT interchange with the .270 Win.; it's a different animal. Good Luck

http://en.wikipedia.org/wiki/6.8_mm_Remington_SPC

Here's .270 Win info for comparison.

http://en.wikipedia.org/wiki/.270_Winchester

Stay safe...

Answer 5

6.8mm = .268
5.56mm = .219

Answer 6

This site should answer your questions about this round.


http://www.gunblast.com/Ruger-RanchRifle68.htm