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Thread: Power of PCP

  1. #1
    Sharp Shooter
    Protea FT Team '08

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    Default Power of PCP

    For those of us that have tried please help me with this question.

    In a PCP with a 8.44 grain 10.5 FP was developed. What would hapen if a 10.5 grain pellet was used ? &|

  2. #2
    Inactive Member

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    the general rule is that pcp's are more efficient with heavier pellet. so with the 10.5g it might be pushing out 11.5 ftlbs.

  3. #3
    Sharp Shooter
    The Professor

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    Difficult question to answer definitively. The common theory states that a heavier pellet in a pcp rifle will be more efficient and develop a higher energy even though velocity is slightly lower.

    That is the theory, but is does not always hold true.

    For instance when I had my Pro-Target I set it up to produce around 780fps with AA Fields for about 11.4 ft.lbs, now out of curiosity I tried using Bisley Magnums to see what would happen - result velocity dropped to 680fps for an energy of 10.78 ft.lbs - so much for the theory in relation to that particular rifle.

    Subsequent testing on my 400 series rifles has produced similar results.

    Dale

  4. #4
    Inactive Member

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    Assuming everything to be equal you should get about 13ft.lbs. But Dale's comments a correct - not everything will stay equal.

    Chrono the gun with the 10.5 pellet. Multiply the weight in grains with the square of the speed in feet per second and divide the whole lot by 450240 to get the FP

  5. #5
    Sharp Shooter
    Protea FT Team '08

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    See this is what I thought as well (more power).I however get 9.8 Fp. I wouls like to haer from somebody with a S400 if they had the same.

  6. #6
    ice's Avatar ice
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    Hi Allan, had the same with my S400. What i have also found is the heavier pellets i've used for the test had a tighter fit in barrel, which will also bring the velocity down.

  7. #7
    Sharp Shooter
    Protea FT Team '08

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    More for me to check on . Going to run out of time to see where I stand.Pitty the sun does not shine all night long

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