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View Full Version : 6.8 spc or 308?


thrillhouse700
08-20-2010, 11:43 AM
I have been reading every thread on 6.8 spc and have become intrigued.

I have always wanted a 308 in an ar platform. Now I am not sure which one I want. A few questions for you guys.

the 6.8 would be lighter than the 308. Effective range approx 600 yds?

Those of you that are into 6.8 already how is the trend of ammo costs?
The only thing really holding me back from this is the availability and cost of the ammo. Will it ever go main stream? Have prices reduced since its introduction?

I would like to get into hunting and don't want to haul a 15lb ar-10, so 6.8 may be a good option for hunting?

The cost to build a 6.8 would be less than a 308 from what I have read in all the threads I have looked at.

Anyways let me know your thoughts fellas.

javalos
08-20-2010, 11:55 AM
I love the 6.8SPC, its a superb cartridge, read up on it on http://en.wikipedia.org/wiki/6.8_mm_Remington_SPC

Basically in a nutshell, it was developed to be shot out of 16" barrels, so there goes any weight concern vs. the .308. Also unlike the 5.56mm, it will not lose any terminal velocity. I am more than impressed with it and I plan to hunt deer this fall with it. Here are the 6.8 forums: http://68forums.com/

thrillhouse700
08-20-2010, 11:57 AM
Sweet, I didnt know about the 16" barrel thing. Thanks for the info.

drs2714
08-20-2010, 12:03 PM
Ammo is cheaper with 308 but gun cost alot more.I love my 6.8 but I reload and that keeps my cost down.The only change you have to make to the AR platform is barrel,bolt and mag to shoot 6.8.For 308 you have to build a whole new gun which should set you back 2K.You can get a 6.8 for less that 1K.Good luck with whatever you go with.I say get both!

ironpegasus
08-20-2010, 12:28 PM
I love the 6.8 SPC. That said, you'd really be pushing things with 6.8 on an AR platform at 600 yards. Doable, yes, but it's pushing it. If I recall correctly you've lost most of your energy at around 500 yards. At closer ranges, there isn't much difference between the two. Ammo to feed it is around a dollar a round if you are buying off-the shelf, but can be hard to find as it's more of a "specialty" round than 5.56 or 7.62. Cheaper if you buy in bulk or reload.

Grayblue
08-20-2010, 12:50 PM
6.8mm is not intended for 600m.

6.8mm rifles are supposed to be used for same purpose and distance as 5.56mm because it's what 5.56mm rifles should have been.

rubber duckie
08-20-2010, 12:53 PM
ill be the first to say it, check out the 6.5 grendel

Jpach
08-20-2010, 1:08 PM
6.8 SPC will be great for your hunting purposes. I dont know what you mean by effective range but you should be good to hunt as far as 350-400 yards with the 6.8 in a 16" barrel (with the correct chamber). Remember, as a hunter you want a fast, humane, ethical, etc. kill.

I suggest you go to AR Performace for your 6.8 SPC upper. Their barrels have chambers that allow the highest velocities with the lowest pressures and since the barrels are nitrocarburized, they will last quite a long time.

AR Performance knows their ****.

thrillhouse700
08-20-2010, 1:08 PM
isn't 6.5g only sold by Alexander arms tho? Wouldn't that make the round even more pricey and hard to come by?

The reason I ask about this round is because if you search on this site or just google everyone is saying its the new up and coming popular round. So Im wondering if ammunition will go mainstream.

Legasat
08-20-2010, 1:13 PM
6.8 ammo costs more and does less. The 6.8 rifle would cost a little less.

.308 would be an easy decision for me.

Nathan Krynn
08-20-2010, 1:19 PM
My entire life I used a model 94 30-30 for all med - large game. So I am used to not having extreme long range and mostly hunt in brush here in Florida and up north.

I have on occasion used a .308 when really needed and it preforms well for its purpose. Last season I used an AR platform .308 and it worked well and you can make them a heck of a lot less then 15 lbs, mine loaded is around 10lbs if I remember right.

By the end of the season I switched to the 6.8 and the rifle is lighter and more handy. It was designed for medium sized barrels like the guy said and even though I do have a 20" bison you can get somewhere like 90% velocity at 16" ( I might be a little off but close).

Ammo is around $1 a round and I use Barnes bullets (I love the solid metal round as they have like 100% retention) and the SSA load on that is like $1.5 each.

With a 200 yard zero the drop at 600 yards is around 117 inches. While it is doable it is not ideal at all and I would use a .308 at that distance. Also the Barnes reliably expands at 1800 FPS and that's in the low 300 yards and it will start expansion at 1600 FPS and that's barley over 400 yards.

I am faster with follow up with a 6.8 then a .308 by far as it is like 1/2 the recoil. It still has around 95% of the muzzle velocity and 60% of the muzzle energy and I am comparing a 110gr to a 168gr so the .308 bleeds it off faster but is still a lot more powerful at range then the 6.8.

So for Florida brush it is awesome and prefer it to the .308, but I would use the .308 for long range.

stormy_clothing
08-20-2010, 1:41 PM
isn't 6.5g only sold by Alexander arms tho? Wouldn't that make the round even more pricey and hard to come by?

The reason I ask about this round is because if you search on this site or just google everyone is saying its the new up and coming popular round. So Im wondering if ammunition will go mainstream.

No the ammo isnt going to go mainstream you can get 500 rounds of wolf for 279 from ammo man ect. Or you can buy 1000 rounds of wold 308 for about the same price.

If this is your first 308 ar do yourself a favor. Buy a Remington r25

https://www.budsgunshop.com/catalog/images/D11/55/55552.jpg

And put a scope on it and your done 1200 + scope. It's not all blacktical but it's a great rifle, lightweight and accurate. If you dont like the recoil add a hydro buffer.

They also make fantastic target and defense rifles btw.

Blk04SR
08-20-2010, 1:58 PM
I'd go some sort of M1A variant.

Super Spy
08-20-2010, 2:32 PM
I've heard of a 7.5# AR308 from Ar15 performance. Yes it still costs more to build one, but ammo is much cheaper and easier to find.

MrPlink
08-20-2010, 2:52 PM
I think the only advantage of 6.8 is the weight. Yeah, inital cost of a 308 platform is a little more, but I think given you can find 308rds for cheaper it will pay for itself.

stormy_clothing
08-20-2010, 3:32 PM
I've heard of a 7.5# AR308 from Ar15 performance. Yes it still costs more to build one, but ammo is much cheaper and easier to find.

You can take the r25 shorten and flute the barrel and get it pretty close

Variable2147
08-20-2010, 8:57 PM
For a light stalking rifle, the 6.8 is my plan. That style of hunting will bring your shots pretty close though <300yds. If you find yourself presented with a 600yd shot, you probably could have brought a heavier gun and not cared because you are probably prone on a hill overlooking a corn field or sitting in a blind.

Also, for distance shooting, there are lighter, cheaper, and better rifle/cartridge combos than a 308 pattern AR.

Any belted magnum bolt action will weigh less than most AR-15s and shoot basically a straight trajectory to 600yds. The key is that from 100 to 600 yds, your POI will be within +/- 3". This is at least true for my 7mm rem mag. slightly different numbers for 300 wby/win mag

shasta2010
08-20-2010, 9:30 PM
personally i think the 6.8 is overated. if you are choosing between the 6.8 and .308 in an ar platform i would go with the .308.

if you really wanted something lighter and great ccuracy go with a grendel or les baer 264 but they can be pricey.

i just dont see much that the 6.8 offers that other cheaper and more traditional round can do better.

btw : for a hunting rifle, nothing can beat a bolt action 30-06 or 308

i have a howa 1500 in 30-06 that i bought with a scope for $439 4 years ago and i have gotten 2 deer and one elk. you cant beat that price and its accurate with a cheap scope.
why spend $3000 for a fancy AR with rare ammo for hunting when a cheap bolt gun is just as good ?

pyro3k2
08-20-2010, 9:46 PM
.308

FMJBT
08-20-2010, 10:05 PM
I'd go 308, or better yet a 243 or 260 chambered DPMS based rifle. The 243 and 260 are both based on the 308 case, but are much flatter shooting. Any of the 3 though would make an excellent hunting rifle for medium sized game. As far as the 6.8, I'm just not overly impressed with it. Like the gas piston conversion for AR's, it seems to be a solution looking for a problem. It does allow you to hunt in states where you would otherwise be restricted by caliber with a 223, but there are definitely better rounds available for hunting with an AR than the 6.8. 6.5 Grendel would be my pick if sticking with the AR-15 platform. Much better long range performance than the 6.8, at least with factory loads. Though the name "Grendel" is proprietary to Alexander Arms, there are other companies that make rifles in the same caliber just under a different name. Model 1 Sales sells uppers in 6.5 Grendel that they call "6.5 Sporter".

thrillhouse700
08-21-2010, 9:44 AM
So where is a good place for .308 uppers? I got some times to make up my mind since I need to save the cash first.

k1dude
08-21-2010, 10:12 AM
Your choice should be between the .308 and the 6.5 Grendel for targets over 500 yards. Not the 6.8 SPC. If you absolutely have to have a 6.8, choose the 6.8 SPC II over the 6.8 SPC. Big difference.

If you want a lightweight rifle/ammo, choose the 6.5 Grendel. But it will cost you to supply it with ammo unless you reload. That's if you can even find factory ammo.

If you want less expensive ammo but suffer with a heavier rifle/ammo, choose an AR-10. Ammo is plentiful but heavy.

The Grendel isn't only sold by AA. It is licensed by AA. You'll find different suppliers of Grendel barrels. And yes, there are now Grendel barrel knockoffs that get around AA's licensing by calling them a different name. Wolf is one of the major suppliers making ammo for the Grendel. Even though it's Wolf, it isn't exactly cheap. And good luck finding any.

I believe the 6.8 SPC II is a hard hitting round out to about 400 or 500 yards. So if you don't need to reach out further, it's a good choice.

12gauge12
08-21-2010, 3:47 PM
Having owned an R-25 and a 6.8 AR. I sold the R-25 pretty quick, mainly because of the weight. lugging that much weight around when its not needed sucks when hunting. Another good thing going for the 6.8 is the choice of bullets since it uses existing .270 bullets. Also, you're probably not going to be shooting out that far while hunting. Ammo is coming down and can be purchased at more and more places for the 6.8 as well

thrillhouse700
08-21-2010, 4:28 PM
So then what about 7.62x39? I have heard they are not very accurate? Man there are just too many choices and not enough money.

ar15barrels
08-21-2010, 8:19 PM
isn't 6.5g only sold by Alexander arms tho? Wouldn't that make the round even more pricey and hard to come by?

Yes and yes.

The reason I ask about this round is because if you search on this site or just google everyone is saying its the new up and coming popular round. So Im wondering if ammunition will go mainstream.

Alexxander refuses to release the specifications to the public domain so that ammo and gun makers can sell them un-impeeded of licensing.
Alexander requires a license (and a percentage) of all sales of 6.5 grendel branded items.
Until that changes, it will never be much more than it is now.

qaz5109
08-21-2010, 8:25 PM
i would go with .308 ar-dude has a 6.8 from addax tactical really nice rifle BUT he also pays 30$ for 20 rounds "GET SOME" if you are going to convert an ar15 platform +1 on 6.5 even though ammo is also expensive