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Thread: TIkka T3 lite .308win and 180gr Ammunition

  1. #1

    TIkka T3 lite .308win and 180gr Ammunition

    Hello Everyone, I got a problem when shoot any brand of ammo weighting 180grns. The rifle spread the bullet all over the target ( even 5" at 100yds with fed ammo).
    This problem do not happens shooting 150, 155 or 168 grns, by fact with lapua Scenar 155grns the rifle do 1" even with Rems UMC can do 1.5".
    Could be the fore end flexing or the excess of vibration in the barrel that touch the stock?

    Thanks!
    Last edited by Torbay; 16-07-2011 at 01:03.

  2. #2
    Don't think it has anything to do with the stock, your rifle has decided not to like 180's. What twist does the barrel have?
    I'd stick to 165/168gr which are mostly a good compromise for 308.
    Ever tried round nose 180's? might be a bit shorter bullet design and therefore fly better with less spin.
    edi

  3. #3
    You'll neeed a faster twist rate to stabilise the 180g bullets I suspect. I'd have thought a factory T3 would come in 1:11 RH twist, and 1:10 might be needed for anything over 150g'ers. That is in your rifle, I'm sure there are others that will work for 180g'ers with this twist rate, but what your rifle likes really can vary tremendously...it's a bit like needing a 1:8 twist in a .243 for optimal performance with 100g to 115g'ers, where the factory standard is 1:10 for 70-90 G'ers.

    Barrel type, length and thickness plays a part too, but it sounds very much like it's a twist issue - if so, only way to resolve it is to use max 165's I'd suspect, or change the barrel for something different....but that's hardly worth it tbh..

  4. #4
    [QUOTE=ejg;
    Ever tried round nose 180's? might be a bit shorter bullet design and therefore fly better with less spin.
    edi[/QUOTE]

    EJg,,were you thinking the bearing surface being shorter would help? not a crazy idea BTW.

  5. #5
    Yes, still i do not try the norma oryx 180grs ( is very expensive ), it is a very flat metplat, but first i want to solve all the problem related to the gun. Do you really think 1:11" cant stabilize the 180 gr bullet? The rem 700 m24 with a twist rate of 1:12" can do it with the m118lr 175gr.
    Anybody has tried 180grs of ant kind with good result in a tr of 1:11?

  6. #6
    Yes, could help because a shorter bullet improve the resulting coefficient in the miller formula. A longer bullet tend to yaw more.

  7. #7

    Sierra Gamekings

    Hi


    I shoot 180 gr Sierra gamekings out of my .308 tika, they are excellent and normally all end up toutching each other on a 100 meter target, i think you can get these on the Winchester Super X ammo, or if you are near the midlands i will gladly give you some to try.

    Regards

  8. #8
    My personal opinion FWIW, I think 180 grn a touch heavy for the .308, maybe better in a 30.06.
    My 1 in 10 twist can't get them as tight at 100 as 150s or 165s, still within about 1.8 inches though so good enough.

  9. #9
    Thanks Howda for the offer! Sadly I live in the new continent (Chile), I will try another brands with premium bullet to see results after do a pillar and action bedding.

    Regards

    Quote Originally Posted by HOWDAH View Post
    Hi


    I shoot 180 gr Sierra gamekings out of my .308 tika, they are excellent and normally all end up toutching each other on a 100 meter target, i think you can get these on the Winchester Super X ammo, or if you are near the midlands i will gladly give you some to try.

    Regards

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