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  1. #1
    Profire Supply / Beagle Dad Aszerigan's Avatar
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    6.8 SPC vs .308 : AR Platform

    I'm up in the air between the 6.8 SPC in an AR-15, or the AR-10 in .308. Shooting out to 500 yards, and the ballistics are similar. Anyone have preferences?
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  2. #2
    Plinker
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    i would go with the 308 round they are still using them for snipers so they must be pretty good and thats my favorite round but the choice is yours good luck

  3. #3
    Expert
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    I would say the .308... just because I am biased lol.

  4. #4
    Grandmaster melensdad's Avatar
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    The ballistics are NOT similar between the two rounds!!! That is a huge honking lie that many people who purchased 6.8 SPC rifles got hooked with. It is a lie.

    The 7.62NATO (175gr OTM) round delivers TWICE the energy at 500 yards (versus the 6.8 115gr OTM). It is also traveling about 350 feet per second faster.

    Please keep in mind that Remington recently DOWNGRADED their performance data for the 6.8 SPC by about 200fps so if you look at old ballistics charts you will have to lower velocity, lower energy and increase bullet drop (old velocity at muzzle was claimed to be 2800fps, revised downward to just over 2600fps and presumes a 24" barrel).


  5. #5
    Expert dave29's Avatar
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    I have also been looking into building a higher powered AR. I wanted to go the .308 direction, but then I decided to stick with the AR-15 platform, instead of going a different direction into an AR-10. My build is going to be the 6.5 Grendel based off of ballistics and standard AR-15 parts.

    If I were going to choose between the 2 in the OP, it would be .308 for sure.

  6. #6
    Expert sporter's Avatar
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    .308/7.62x51 end of story.

  7. #7
    Expert John Galt's Avatar
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    I just saw this and don't have the ballistics in front of me, but dig into the 6.5 Grendel. It is an AWESOME AR platform and accurate as you will probably ever be. I absolutely LOVE this round and can't say enough good things about it.

    Best of luck and safe shooting!
    DORMANT Marine, NRA Golden Eagle Member, GOA Life Member, ISRPA Life Member

  8. #8
    Grandmaster melensdad's Avatar
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    Quote Originally Posted by John Galt View Post
    I just saw this and don't have the ballistics in front of me, but dig into the 6.5 Grendel. It is an AWESOME AR platform and accurate as you will probably ever be. I absolutely LOVE this round and can't say enough good things about it.

    Best of luck and safe shooting!
    Try this chart, its an old one, one with the original inflated 6.8 SPC claims, but the rest of the chart is accurate. The 6.8 SPC numbers have to be downgraded on this chart, see the smaller chart above for some more accurate numbers regarding the 6.8 SPC.


  9. #9
    Sharpshooter 243rem700's Avatar
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    I would go for either 6.5 Grendel or the .308. The 6.5 has better ballistics, but the .308 is more common. Plus the .308 is a .308.

  10. #10
    Expert
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    Quote Originally Posted by 243rem700 View Post
    I would go for either 6.5 Grendel or the .308. The 6.5 has better ballistics, but the .308 is more common. Plus the .308 is a .308.
    That, and you can load a DT 200gr .308 with 1732ft/lbs at 500 yards

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