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Thread: Chronograph MV results

  1. #1

    Chronograph MV results

    Gents,

    On analysing the MV of a 20 shot string, how much deviation would you expect between shots.
    What would be an acceptable tolerance of the batch before you would question your reloading technique.

    Cheers Aye

  2. #2
    Slngle figures is what your after for shooting longrange,20fps is more common, you have got to be real fussy to get single figures

  3. #3
    Quote Originally Posted by ROE224 View Post
    Gents,

    On analysing the MV of a 20 shot string, how much deviation would you expect between shots.
    What would be an acceptable tolerance of the batch before you would question your reloading technique.

    Cheers Aye
    Almost impossible to say from this vantage point. I have seen good CF rifle loads in 308 with as little as 13 fps spread for 20 shots but this was ammo loaded to exceptional standards using new brass of the same LOT, sized and prepped identically. IT is noteworthy that the load with this brass was not the most accurate tested that day. A load with about 34 fps spread was.~Muir

  4. #4
    If you want to be scientific about it then plot each batch on a graph. The spread on the vertical and the powder measure on the horizontal. If you record at sensible intervals you will get a sine wave with each 'sweet' spot visible.

  5. #5
    I like to get a good load myself. (see 18" 308 loads thread) But to be honest if 3 or 5 bullets hit a group under a inch I'm happy. Nothing wrong with all this science etc and great if you enjoy it. I much rather go stalk a deer though. Even better if I manage to shoot one. Happy loading.

  6. #6
    Quote Originally Posted by woodmaster View Post
    I like to get a good load myself. (see 18" 308 loads thread) But to be honest if 3 or 5 bullets hit a group under a inch I'm happy. Nothing wrong with all this science etc and great if you enjoy it. I much rather go stalk a deer though. Even better if I manage to shoot one. Happy loading.
    My range is in a large wood and I often get a stalk on the way in or the way out!

    It's never time wasted! But there again you need time in the first place. Personally if I couldn't do a proper job of it then I would just shoot factory ammo.

  7. #7
    Quote Originally Posted by Tackleberry270 View Post
    If you want to be scientific about it then plot each batch on a graph. The spread on the vertical and the powder measure on the horizontal. If you record at sensible intervals you will get a sine wave with each 'sweet' spot visible.
    Hi Tackleberry,

    Don't know much about the reloading game yet, your quote is interesting.
    Does the sweet spot location on the sine wave vary from barrel to barrel and calibre?

  8. #8
    Quote Originally Posted by ROE224 View Post
    Hi Tackleberry,

    Don't know much about the reloading game yet, your quote is interesting.
    Does the sweet spot location on the sine wave vary from barrel to barrel and calibre?
    I'm no expert and I haven't done this with enough rifles/caliber to be able to answer from experience but theoretically it will be different for every rifle, calibre, bullet combination.

  9. #9
    And where in the sine wave is the sweet spot, at the outermost parts of the wave or at the mid line? It might be worth looking up the dan Newberrys ocw method of load development to see how these correlate with these sweet spots

  10. #10
    It's going to be a peak or a trough depending on which way you have plotted the extreme spread on the axis.

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