6.8 SPC or 6.5 Grendel?

Discussion in 'AR-15 Discussion' started by bajazoni, Oct 29, 2012.

  1. bajazoni

    bajazoni New Member

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    I could use a little help in which cartridge to go with in my next AR. I plan on building it from scratch in either 6.8 SPC or 6.5 Grendel. I would be using the rifle mainly for hunting, but it would also be a zombie gun. From what I have been able to find they are about equal out to about 500 yards, which is way farther than I plan on shooting anything. Other considerations are ammo availability and cost, both factory and componants to reload. Any help is welcome and appreciated.
     
  2. sputnik1988

    sputnik1988 New Member

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    I had a similar thought awhile back. In my very limited experience and with a little research, I came to the conclusion of neither. A 308 is a much better cartridge at range and is more suitable for medium game. The ammo is also cheaper.

    This was my conclusion, doesn't necessarily make it the best for you though.
     

  3. bajazoni

    bajazoni New Member

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    thanks sputnik, the .308 was also my first thought, but in an AR platform we are talking about a 10 pound rifle as opposed to a 6.5 to 7 pound rifle. I also considered the 300 blackout but the ballistics are the same as the 7.62x39, in that case I may as well just use an AK or SKS.
     
  4. sputnik1988

    sputnik1988 New Member

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    DPMS and a few others make lightweight 308 uppers and barrels if it would make a difference to you.

    You could build one that comes in at 7-8 pounds
     
    Last edited: Oct 29, 2012
  5. mich1377usmc

    mich1377usmc New Member

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    Baja -- I was having the same problem with my build, which caliber 6.5 G or 6.8 SPC . I chose the 6.8 SPC, atleast SSA has bulk ammo packs . BTW taking her out this AM to test drive it, been looking at her on my reloading table for a week now , have itchy trigger finger MUST travel to range. I do reload so shooting ammo no big problem, the is a large selection of bullets for the 6.8 SPC ( .270 ) to choose from so that was the main factor in my choice. Good Luck making your choice Mickey
     
  6. msup752

    msup752 New Member

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    The 6.5 Grendel outperforms 6.8 in just about every way. The problem is price and availability. There are more 6.8 choices although since Grendel went into the public domain, the gap narrowed a bit.
    The Grendel is best for accuracy and distance. Many Grendel shooters hit targets out to 1000 yards and beyond. The low ballistic coefficient of the 6.5 bullet allows it to stay supersonic several hundred yards down range.
     
  7. purehavoc

    purehavoc New Member

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    Think of it like this the 6.5 grendel is more like a .338 , 300 win mag , long distance round the 6.8 spc is more like a AK 200 yard battle round . Both have different purposes just because there both 6. something certainly doesnt even put them in the same category .
     
  8. Sniper03

    Sniper03 Supporting Member

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    bajazoni,

    This is a lot of information to consider. The ARs in the 308 as stated are significantly heavier than the AR-15 rifles obviously with the 16 inch barrel at around 8+ Lbs unloaded. I am a fan of the 308 also so not knocking it at all. In the AR-15 platform I am a stance fan of the 6.5 Grendel. It performs unbelievably even at long ranges. As it will flat turn a prairie dog inside out at 400 yards. Ammo use to be a big issue but is getting resolved more and more since Hornady is now loading ammunition for it and if you plan on reloading it is a breeze to load them. Dies and various bullet grains are now available as well a casings. The 6.8 is not an overall bad round as we have killed deer with it also. But comparing the 6.5 stands out in performance. In addition Hornady makes a 95 grain V-Max that is excellent for predators and a 123 Grain for deer size game. The only thing with the 6.8 or the 6.5 if you reload you want to be sure and pick up your spent casings. But if you already have an AR-15 in 5.56 and are looking for something that is extremely accurate, effective and will shoot even long range the 6.5 might be the ticket?

    03
     
  9. AgentTikki

    AgentTikki New Member

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    One more thing to consider.

    6.8 outperforms the 6.5 with shorter barrels. It shows its true strengths when used sbrs. Its pretty maxed out with 16" barrels.

    The 6.5 gets better the longer the barrel is. Its a waste when used in sprs and unbelieveable with 24" barrels. Its kinda a waste even with a 16".


    So, if you want a 16" or shorter barrel go with 6.8. If you want a 18+" 6.5 all the way.
     
  10. theboarbuster

    theboarbuster New Member

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    I have both a 6.8 and a 6.5. The only thing the 6.5 does better than the 6.8 is shoot flatter beyond 600 yards and that isn’t by much. Muzzle velocity of factory ammo from a 16" 6.8 and a 20" 6.5 is the same. The 6.8 does work better in shorter barrels. Of the 2 rifles I use the 6.8 more because it is shorter and easyer to manuver. There are more Factory ammo offerings with the 6.8. Both are good calibers and this subject gets beat to death. Shoot both and find the one you like.
     
  11. bajazoni

    bajazoni New Member

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    thanks for all the good info, I think I'll build a 6.8 first with a 16" barrel, then build an upper in 6.5 with an 18" or 20" barrel.