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Long Range Problem

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  • Long Range Problem

    The gun is a 338 Lapua Ackley Inproved, Componets: Action Sako M995, Stock McMillian A5, Barrel Rock Creek 26", Twist rate 9.4, Contour #5
    Bullets used are all 300gr, Sierra, Lapua, Berger, hollow point boat tail
    Muzzel Velocity ranges between 2850-2950 fps
    @ 100 yards they are grouping in a 1/2 inch or less
    They all hold their MOA out to 600 yards with the Sierra being the best, then Lupua and then Berger. Farther than 600 years and they all go out the window, with the Berger not even printing on a 3ft by 3ft target. When I do manage to get a shot on the paper at 1000 yards, they seem to have a keyhole look to the hole. I assume I have a twist rate problem, would like your opinion of this and suggestions on curing the problem, be it a new barrel or whatever.

  • #2
    Hello Brian,

    Based on the supplied information we would recommend doing a check of the barrel twist rate to make sure that it is indeed spinning at 1:9.4". The twist rate being shown would be more than enough to fully stabilize our bullet, as well as the others. What you are describing are bullets that are not being stabilized properly and this is primarily controlled by the barrel twist rate. With our bullet you would see a fully stabilized bullet with our recommended 1:10" twist rate. We would think that if this barrel actually specs. out slower than 1:10" you will have found the culprit.

    Bob Blaine
    Technical Specialist
    Berger Bullets