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Thread: 708 questions

  1. #1
    Member Marty Henry's Avatar
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    708 questions

    OK owners of rifles using this round what sort of bullet weights and speeds do you get.
    Yesterday a neighbor came to use my range to try out some new amo for this queen of calibres.
    Curious as i dont know anyone else with one I tagged along and took the chrony.
    He normally uses federal blue box 150 but had a few different 139s to try.
    The rifles a Tikka t3 cut to 19 inches, the blue box chronied at 2450 fps, and both lots of the 139s at 2684 and 2680, he seemed pleased but I thought them pretty pedestrian, my m43 762x39 russian matches the blue box and my 308 pushes a 165 gr bullet faster than the 139 bullets he was trialling.
    The results left me less than impressed with the 708, is this normal?

  2. #2
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    i have a short 16.5 inch 708 im getting those sorta speeds from the factory stuff.
    hand load 139 going about 2750ish
    120s going 2850
    both warm esk.
    the barrel chop cost me 200-300 fps , kills the same though.

  3. #3
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    Seems slow to me for 19" tube. My tkka does 2800 with 150gn eldx. That's with a full case of RL17 and 20" barrel.

    I'd have expected the fed 150 to be at least 2600ish and the 139 2700ish with that barrel length. Sure the chronograph is reading okay?

  4. #4
    ebf
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    Mushroom juice ! Hic ! ebf's Avatar
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    I load for accuracy, not speed...

    22 inch barrel

    162 Amax : 2600 fps
    120 Nosler BT : 3050 fps

    14 inch barrel

    120 Sierra Pro Hunter : 2645fps
    chainsaw likes this.
    Viva la Howa ! R.I.P. Toby | Black rifles matter... | #illegitimate_ute

  5. #5
    Member Marty Henry's Avatar
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    The chrony was running right I had the 223 with me and it read 3050 for 1 shot which is right. Federal say on the box 2600 something but that would be in a test barrel though.
    We should all load for accuracy over speed ebf, but these seemed a bit dawdly in my opinion accuracy seemed pretty ho hum as well but that was probably just him.
    Last edited by Marty Henry; 09-03-2020 at 07:42 AM.

  6. #6
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    308 will always do better than a 708 from a short barrel.
    My 20" 708 gets 2707-fps with Hornady Precision hunter 150ELD-X, mild reload's I get 2754 with 140Gr SGK and 2657 with 154 SST's (slightly warmer load)
    Federal Fusions do better with a shorted barrel than blue box for some reason
    Last edited by winaa; 09-03-2020 at 08:08 AM.
    BC doesn't matter, until you need to dial

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    16" barrel I'm running Hornady ELD-M 162gr at 2600 fps. Stopped when my groups tightened up.
    superdiver and winaa like this.

  8. #8
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    #stopfuckinshorteningriflebarrels
    A big fast bullet beats a little fast bullet every time

  9. #9
    Member Rock river arms hunter's Avatar
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    @ebf

    I'm curious as to how you're 162gr A Max's go on deer ?

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    Quote Originally Posted by Rock river arms hunter View Post
    @ebf

    I'm curious as to how you're 162gr A Max's go on deer ?
    At that speed they will be perfect. My 162eldms were savage at a higher speed but would have happily run them at 2600

  11. #11
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    Quote Originally Posted by 7mmsaum View Post
    #stopfuckinshorteningriflebarrels
    No shortening is ok just don't complain about speed haha. Have learnt my lessons over the years

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    @Marty Henry
    What is the barrel length of your 308 and are you shooting factory ammo or reloads? for comparison
    But I agree those speeds seem about 100fps too slow.
    Most factory 708 ammo use a slower burning powder than 308 so suffer quite a lot by loosing 5 or more inches of barrel (from the 24in test barrels used in the factory)
    BC doesn't matter, until you need to dial

  13. #13
    Member Marty Henry's Avatar
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    22 inch with reloads I just mentioned it as a comparison as I thought the lighter bullet would have had more speed than that.

  14. #14
    ebf
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    Quote Originally Posted by 7mmsaum View Post
    #stopfuckinshorteningriflebarrels
    Hahaha,

    The 14 incher is not only short, it is a wee little pencil thing... 0.625
    Viva la Howa ! R.I.P. Toby | Black rifles matter... | #illegitimate_ute

  15. #15
    ebf
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    Quote Originally Posted by Rock river arms hunter View Post
    @ebf

    I'm curious as to how you're 162gr A Max's go on deer ?
    Very happy with it. The 162 ELD-M is pretty much the same projectile. Did not have to make any changes to my loads between the AMAX and ELMD, and I would confidently shoot both of those at animals, steel or paper. It is as close to the perfect all-round bullet as I have found.
    Viva la Howa ! R.I.P. Toby | Black rifles matter... | #illegitimate_ute

 

 

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