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Friday, September 3, 2010

Urban Survival Firearms - Is the 6.8mm SPC a good Survival Collapse Cartridge received the following question regarding Urban Survival Firearms and choices of caliber. "Me and another Survival prepper are deciding on what gun we are going to get. I’m thinking that an M-16 type rifle in the 6.8mm cartridge would give us both firepower and stopping power. What do you think?"

Urbanman replies: The 6.8 SPC (6.8 x 43mm) due to it’s overall length and relative low chamber pressure made the M16 or AR platform adaptable to this cartridge. Although the bullet diameter is smaller, I tend to think of this cartridge like a the M43 AK round (7.62x39mm).

It is a good stopper and was developed and pushed by elements of the Army Special Forces community to replace the 5.56x45mm (.223 Remington) as small groups of Special Operators would find themselves in a "target rich environment" and the 5.56 was failing to put people down for the count. This was largely due to the SS109 bullet - steel core penetrator, which had too much penetration and did not leave all of it's energy in soft skinned targets.

The 5.56x45mm standard military round in the 62 grain SS109 configuration has a muzzle velocity of approximatley 2,700 fps depending upon barrel lengnth. The 6.8x43mm SPC round with a 115 grain bullet travels at 2,800 fps. More diameter and weight, and more velocity, give the 6.8mm SPC the edge of which round is a better stopper.

I would not begrudge anyone going to the 6.8mm round in an AR platform. The considerations would be ammunition availability and price - certainly much, much cost involved than stocking the abundant .223 Remington. The cost difference between equal amounts of rounds has to have the 6.8mm SPC costing twice as much if not more. Are you going to be to stock 4,000 rounds per gun? That's my base figure for ammunition on hand for each main long gun. I'll stick to my AR platforms and the 5.56x45mm round.

The bottom line, as I am reminded by readers all too often, is to have a long gun for these lawless survival environments; be able to use it well; and have sufficient ammunition for it. Sounds like good advice to me.


  1. This post is really too informative to us, good perception of images and good description by which any one can get information what they want to this post.......As for as my thinking is concerned this one is the best post.

    Thanks for sharing such a informative post.
    6.8 spc ammunition

  2. 223 vs 6.8 spc? its all about what you can afford the 6.8 spc is a really expensive round to buy you can buy two or three boxes of 223 to its one?

  3. If you have a choice, buy both uppers. If in the next few years military and law enforcement adopt the 6.8 and the colaps has not come into fu7ll fruition, ammo will be cheep. If you reload, 5.56 can be necked out as I understand it and 6.8 can be squeezed down.