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Safonator
07-12-2009, 12:12 PM
Im researching building an AR10. or perhaps a 6.8spc. i was comparing the cost of ammo and they seem about the same price. The 308 seems like it would be more a more available round, while being more effective. i also notice they refer to the 308 as 7.62 nato. Would 7.62x39 bullets work as they are cheaper than both?
Also gas piston upper, yes or no?

AdamM
07-12-2009, 12:14 PM
Nope, 7.62x39 will NOT work in 7.62 NATO/.308

nicoroshi
07-12-2009, 12:28 PM
AdamM is correct. The 7.62x39 is the Shortened version to fit AK magazines.
The 7.62 NATO has a much longer casing.
As for your questions it really depends on your purpose for the rifle.
300 yards or less I like the 6.8 SPC but reload it to keep the ammo cost down. The trajectory of the 115gr .277 6.8 SPC is about the same as the .224 77gr of the .223.
Anything 400+ in range I would opt for a .308 but again would reload to keep ammo cost down.
I would also opt for a nice bolt gun in .308 over an AR for the longer range work.
Just my thoughts on it.
YMMV

Fjold
07-12-2009, 12:41 PM
If he thinks that 308 Win ammunition is expensive, he'll have a heart attack buying 6.8 SPC

X-NewYawker
07-12-2009, 12:44 PM
Yeah. 6.8 is WAY more expensive that 7.62x51 NATO (308 winchester)

Where are you looking?

Linh
07-12-2009, 1:03 PM
There are pros and cons for the 7.62x51 vs 6.8 round.

So you should carefully research both and purchase the one that fits your tasks for it.

Just remember everyone wants to think they are a sniper and shoot out to over 500 yards etc......but most people will never shoot past 100. (Just my opinion)

I would get a piston if I could afford one. Or if it cost too much then at least get a quality upper.

A 6.8 round runs around a dollar. A high quality 5.56 will also run a little over a dollar.

Safonator
07-12-2009, 3:10 PM
I did my bullet price comparrison here
http://www.ammunitiontogo.com/catalog1/index.php/cName/rifle-ammo

Comparing the 200 round prices, the 6.8 seems cheaper for factory loads at least not much though. I see they have the european Millitary ammo in 308, is this, ammo any good?

Safonator
07-12-2009, 3:21 PM
Anything 400+ in range I would opt for a .308 but again would reload to keep ammo cost down.
I would also opt for a nice bolt gun in .308 over an AR for the longer range work.
Just my thoughts on it.
YMMV

Looking for versatility, Max stopping power upto 800m if that far, while still controlable in CQ. Yet after looking at the price of 5.56 ammo, and the prices of some nice bolts, Perhaps Buying a bolt .308 may be more feasable. in the end versuse buying multiple uppers.

Thanx for your input everyone.

Mssr. Eleganté
07-12-2009, 3:31 PM
I did my bullet price comparrison here
http://www.ammunitiontogo.com/catalog1/index.php/cName/rifle-ammo

Comparing the 200 round prices, the 6.8 seems cheaper for factory loads at least not much though. I see they have the european Millitary ammo in 308, is this, ammo any good?

Almost all of the 7.62x51 ammo is cheaper than the 6.8 ammo at that link. The expensive 7.62x51 ammo that you see there is either match grade or specialty ammo.

CSACANNONEER
07-12-2009, 3:42 PM
Im researching building an AR10. or perhaps a 6.8spc. i was comparing the cost of ammo and they seem about the same price. The 308 seems like it would be more a more available round, while being more effective. i also notice they refer to the 308 as 7.62 nato. Would 7.62x39 bullets work as they are cheaper than both?
Also gas piston upper, yes or no?

If you are talking about bullets for 7.62x39 then yes, you can use them to load .308 cartridge, once you resize them from.310-.312 to .308-.309. The problem is, it appears that you are asking about loaded ammunition and not just bullets. The bullets are just the projectiles that fly through the air.

Omega13device
07-12-2009, 5:07 PM
My handy dandy quick reference for ammo noobs...

Bullet
http://www.midwayusa.com/mediasvr.dll/image?saleitemid=490923

Cartridge
http://ammoman.com/bbul_rif_223rem.jpg

Safonator
07-12-2009, 7:07 PM
My handy dandy quick reference for ammo noobs...

Bullet
http://www.midwayusa.com/mediasvr.dll/image?saleitemid=490923

Cartridge
http://ammoman.com/bbul_rif_223rem.jpg

Thanks for pointing out my Noobness. I should have caught that. So would .308 be practical for sub 200m targets?

nicoroshi
07-12-2009, 7:15 PM
Thanks for pointing out my Noobness. I should have caught that. So would .308 be practical for sub 200m targets?

Certainly, and way beyond that as well.

Safonator
07-12-2009, 7:25 PM
Certainly, and way beyond that as well.

Perhaps i worded that wrongly, My main concern is making the gun short enough legally to be suitable in a Urban/ Close quarters MOA while still being able to utilize the 308 round to it's potential. I guess my next thing is barrells, and how much accuracy is lost as length decrease. Steel is good right? Any threads here on that? :confused:

Brutish
07-12-2009, 7:36 PM
Perhaps i worded that wrongly, My main concern is making the gun short enough legally to be suitable in a Urban/ Close quarters MOA while still being able to utilize the 308 round to it's potential. I guess my next thing is barrells, and how much accuracy is lost as length decrease. Steel is good right? Any threads here on that? :confused:

Accuracy is not directly affected by barrel length (to a point). In fact, to a degree, a shorter barrel may be more inherently accurate due to being stiffer.

In rifle length barrels, shorter barrels just give you less muzzle velocity and thus less range and since the round goes subsonic earlier, less accuracy at the extend of the range of the round.