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Thread: Nato 7.62x51: 148 grain vs 175 grain

  1. #1
    Plinker

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    Nato 7.62x51: 148 grain vs 175 grain

    Has anyone shot and compared these too rounds for accuracy? I am curious as to how the 175 grain compares with the 308 168 grain ammo too.

  2. #2
    Expert Robert Richardson's Avatar

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    The 168s and 175s have better accuracy. Most all match ammo is 168 and 175.
    1911s are like Glocks except they are for grown-ups.

  3. #3
    Expert

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    Depends on range.
    Heavier bullet keeps momentum at distance, higher velocity at any given longer range.

    Short range it doesn't much matter, the lighter bullet won't drop to trans-sonic or sub-sonic.
    Lots of guys shoot light bullets very accurately at shorter ranges, see varmint bullets...

    Given the same muzzle velocity, same wind resistance/ballistic coefficient, a heavier bullet will maintain momentum better.
    Out here where we can shoot longer distances, when a guy is shooting MOA out to about 600-800 yards,
    The rifle/round will do MOA out to a certain distance, then the group will suddenly spread out.
    This is the limit of the bullet being used, where it starts to yaw in flight.

    The lighter the bullet, the sooner it looses momentum to wind resistance.

    This is discounting internal ballistics, the rifling twist rate, the depth, width, number of rifling lands/grooves, overall diameter of the bore, etc.
    Most of us try several different weights, slightly different diameters of bullets to find out what works best with the rifling.
    Last edited by JeepHammer; 07-27-2020 at 16:32.

  4. #4
    Grandmaster

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    Wouldn't twist rate also impact bullet choice?

  5. #5
    Plinker

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    I have a rate of 1:10.

  6. #6
    Expert DadSmith's Avatar

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    Quote Originally Posted by bar68 View Post
    I have a rate of 1:10.
    I have a Ruger RPR 308 1:10 and an Aero Precision 308 1:10 both of them prefer 175gr.
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  7. #7
    Grandmaster bcannon's Avatar

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    I always go with a heavier grain bullet for accuracy and consistency, long or short range no matter the twist rate. That decision has worked great for me so far..
    Last edited by bcannon; 07-28-2020 at 08:49.

  8. #8
    Grandmaster

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    I have pretty much moved to 175gr because of the heavier bullet that gives better resistance to wind, more retained energy and a smidge more accurate. The 168gr ammo is still good to go though in my opinion. Lot's of veteran snipers went their whole career using 168's just fine so it's hard to argue they aren't a viable option, it's just that the 175's are a bit better in those same areas.

  9. #9
    Marksman luvall's Avatar

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    I can get a slight improvement with 175 using my Savage Fclass 1:10 twist
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  10. #10
    Plinker

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    Depends on what you're shooting it in.

    My bolt guns all like the heavier bullets. 175 is a great weight in my m70.

    My G1 and STG58 both prefer the 148/150gr pills. Though you could argue accuracy in an FN FAL with the original barrels is a relative term


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