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Thread: 6.5 x 55 Ackley Improved

  1. #1

    6.5 x 55 Ackley Improved

    Hi,has anyone out there got any information on the 6.5 x 55 Ackley,loads, performance,accuracy etc..Regards,C.

  2. #2
    Just get a 6.5*47 Lapua instead.
    So much to learn and so little time left

  3. #3
    Quote Originally Posted by NigelM View Post
    Just get a 6.5*47 Lapua instead.
    Probably so.
    Loads are starting loads for the 6.5x55. Ackley chambers are nothing magic and do not insure greater velocity (myth 1) nor longer case life. (myth 2) They give a higher velocity at 1/4 the increase in powder charge. If you increase powder by 10% expect a 2.5% increase in velocity. (all other factors remaining the same, of course) ~Muir

  4. #4
    Established Poster
    Join Date
    Oct 2009
    Tokoroa, South Waikato,NZ
    The only advantage for the AI is less case stretch, you need more powder to get the same velocity, I used to shoot a lot of F class with a 6.5x55 a friend had the AI version
    he was loading 5 to 6 grains more powder for 50fps more velocity and mine had better accuracy he had his re-chambered to 6.5x47, you would be better off with a 6.5-284
    case capacity is about the same as the 6.5x55 AI barrel life is similar and you don't have to fire form cases. Robert

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