chrono,accuracyi

Discussion in 'Reloading' started by timmyatnop, Aug 10, 2010.

  1. timmyatnop

    timmyatnop Well-Known Member

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    I own an chrono that's Mabey
    3 years old ,it has the computer readout on the machine below the v shaped whiss bangs . Anyway I have a deviation of 45 fps with my reloaded shellsi ,Mabey my chrono isn't as accurate as I want ,I want 20 fps deviaton or less .does anybody have any suggestions on really accurate chronos.thanks timmy.
     
  2. J E Custom

    J E Custom Well-Known Member

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    Oehler is making the 35p and it is considered the benchmark that all chronographs are
    measured by and there service is second to none.

    J E CUSTOM
     

  3. timmyatnop

    timmyatnop Well-Known Member

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    The oheler is 575$ ,am I gona have to spend that much so iam not second guessing my old chrono.any suggestions on a bit cheaper one that's still great quality.
     
  4. J E Custom

    J E Custom Well-Known Member

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    I know that is a lot of money but you get what you pay for when you buy electronics.

    There are cheaper ones and they work well most of the time but they don't seem to
    last very long.

    Most will run $250.oo+ and you can expect 3 to 5 years of use from most and then
    you will have to replace it.

    I have an old 35p Oehler that is 20+ years old and it is still accurate (Same load, Same
    velocity) and back when I bought it it seamed like a lot of money ($230.oo) but some
    of my friends have gone through 3 or 4 of the cheaper models and are allways asking
    to verify there velocities on my chronograph.

    It is a lot like the scopes , the cheaper scopes have to be replaced several times in the
    life of most rifles but the better ones don't and end up being the cheepest in the long
    run.

    This is a wonderful tool and will save you lots of time,money,barrels and bad hunting
    experances.

    If you are /want to get into long range shooting/hunting it is almost a must.

    J E CUSTOM
     
  5. timmyatnop

    timmyatnop Well-Known Member

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    I think i will give them a call and chat with them to day.Might take a couple of paychecks to have enough but your proubly right ,if iam gona do this for the rest of my life i might as well do it right. Thanks for the good advice.
     
  6. royinidaho

    royinidaho Writers Guild

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    Shoot a 22LR through it. Those are pretty consistent.......

    I've found, with the less expensive units, that actual velocity may be off a bit but shot to shot variations are fairly decent.
     
  7. BountyHunter

    BountyHunter Writers Guild

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    Ha, have not seen it IF it is there for less money and I have had several.

    Buy the 35P and you will never regret it. No second guessing.

    BH
     
  8. Sako7STW

    Sako7STW Well-Known Member

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    Why worry about that much deviation? I would shoot 5, take an average and that's what I base my calculations on. From there I let the paper do the talking to me. Save yourself the $500+ and do more shooting.
     
  9. J E Custom

    J E Custom Well-Known Member

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    That's what I use to think long ago but I found that the chronograph was a lot more that a tool
    for velocity differences. they can do a lot of things for the shooter, especially the long range
    shooter.

    They can tell you about pressures,velocities,Standard deviations,Extreme spreads,True Ballistic
    coefficients of a bullet, how to calculate a drop chart if you cant check it at the range, the effects
    of wind on your bullet and many more uses because you have a very accurate base line for your
    rifle and load combination.

    If you are just going to measure spread then a cheep chronagraph will work (Most of the time)
    and any error in velocity doesn't matter anyway especially if only shooting 2 or 300 yards.

    Knowing everything you can about your rifles performance can only help to become a better
    shot and more consistant shot to shot especially at longer ranges.

    J E CUSTOM
     
  10. timmyatnop

    timmyatnop Well-Known Member

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    Well iam thinking about a new chrono,before I do though iam gona try the 22 long rifle thing first and see how close they are.
     
  11. boomtube

    boomtube Well-Known Member

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    "I own an chrono that's Mabey ... (sic)"

    Is that a brand name? And why do you think your ammo is more consistant than your "chrono" says?
     
    Last edited: Aug 11, 2010
  12. phorwath

    phorwath Well-Known Member

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    Re: Oehler 35 P shipping this week

    I placed my order for one of the 2010 run Oehler 35Ps in May 2010, and received a phone call from the Oehler folks yesterday. Their first batch of 2010 manufactured 35Ps are shipping out this week and I am on their shipping list for their first shipment.

    I ordered pretty early after learning that Oehler would be manufacturing some 35Ps again this summer. Looking forward to putting it through the paces.
     
  13. J E Custom

    J E Custom Well-Known Member

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    It's not so much the difference from round to round but the accuracy of the numbers that
    will tell you what you realy need to know.

    I will share a couple of examples that convinced me that it realy makes a difference how
    accurate the chronagraph is.

    First - A frend of mine has a 30/338 lapua improved. After some load testing it was exceeding
    loading velocities with no sign of pressure. If he had loaded up to pressure signs it would have
    exceed the SAAMI pressure for that round. but with an accurate chronograph he knew he was
    loading high pressure loads even though there were little or no signs of excessive pressure.

    Another example was while testing a custom 17 HMR with A custom barrel the listed velocities
    from the ammo maker was exceeded by 60 ft/sec ,and as we all know the listed velocities are
    normally inflated. so having a stock factory rifle in 17 HMR I decided to chronograph the same
    ammo in the factory rifle, The results were withen 10 ft/sec of the factory listed velocities (they
    were Lower).

    If it is very accurate it will give you confidence in your ammo and improve the accuracy of your
    untested drop charts. (Beyond the test range distances).

    An inaccurate tool is not worth very much, but an accurate tool is invaluable !!!

    J E CUSTOM
     
  14. royinidaho

    royinidaho Writers Guild

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    I agree with J E,

    I'm mentoring a fella getting into LRH. He has a darned accurate Win 70 Featherweight '06. Last week we chrono'd factory 180a 2800 plus.

    This week he put on a Holland Leupold. To sight in we used loads from the same box of factory ammo. Velocity was more than 100 FPS less than last week.

    I guess what the little blue Chrony is telling me is that there are bullets exiting the barrel and not much more than that.:rolleyes: