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chronies ??

Discussion in 'Shooting Gear and Storage' started by tahoe2, Apr 25, 2013.

  1. tahoe2

    tahoe2 Well-Known Member

    so many choices ; where to start ?
    what for ? Is it worth the expense ?
    range trip once a month or so to check out new load combinations, that's about it.
  2. CB900F

    CB900F Well-Known Member


    In my opinion, if you reload, having a chronometer is essential. A good one can give you information that really pays off both on the bench and in the field. For instance, if your pet load is traveling 200 fps faster than the book you got the recipie from, it's a good bet that your pressures are above what's considered to be safe in that gun. Same thing applies if you get a chrono & then think you have to add powder to get the load up to the velocity shown in the manual. Usually there's only two things that can allow a bullet to trip the screens at a higher speed: 1, more pressure behind the bullet or 2, less resistance as it traverses the barrel. Less resistance usually means that accuracy is not in the picture, although there was that moly craze awhile ago.

    Then there's the standard deviation calculation, or S/D. Which is an excellent indicator of how consistent your load is velocity-wise. This becomes more important when shooting at extended ranges, but is good information regardless. Basically, and I'm not a mathemetician, it tells you what the average difference in velocity is from shot to shot. A lower S/D indicates better consistency.

    What's the best one for you? I haven't a clue. Put 'em in two categories. One, the expesive parts sit on the bench & only the screens are downrange. Two, everything's out there in the bullet's path. Then search for all the various threads here on THR of: "I shot my chrono!".

    I've got an Oehler 35P that I bought in 1997 & it's running just fine, although I have recently had to have the print head replaced. The Oehler company has always been supportive & provided top notch service when I needed it.

  3. Reloadron

    Reloadron Well-Known Member

    You can buy a chronograph that will give you basic data for about $80 and you can buy a chronograph for $550. The more they do (features) the more they cost. Based on your post a Simple Chrony F1 Chronograph would likely be fine.

    Like CB900F I have an Oehler 35P my wife gave me around '95 that still works just fine but today that unit from Oehler is a pretty high end unit. I doubt you want one like that.

  4. 119er

    119er Well-Known Member

    I had a CED Millenium(first version) that did very well. It even recorded the velocity that killed it! It was completely my fault for trying to force it to work in impossible lighting conditions(low afternoon sun on a very heavy overcast day). .357 Mag made quick work of it. That was the first time(and last) I had trouble getting it to pick up the bullet. I just got the CED M2 in the mail and have yet to test it out. If it works as good as the first one it will be great. I like the display being on the bench in front of me and it has the ability to download data to a computer. I paid $199 for mine.

    It has given me the ability to maximize my loads. It has shed light on issues that I would not have known about. I could see the effects of seating depth on velocity. Seating my bullets way out(factory barrel) caused a 150-200fps loss w/ certain propellants.

    BTW make sure you get a decent tripod w/ pan and tilt to make sutup easier on uneven ground.

    I would love an Oehler(Texas company too!) but I'm a student and on a budget.
  5. jmr40

    jmr40 Well-Known Member

    This is what I use.


    There are others that will give a printout of data or even download it directly to a computer. This isn't that fancy. I've seen test data showing some others costing 3X as much are slightly more accurate. But these were within 15-20 fps of the more costly units. That is close enough to be certain you aren't getting an overpressure load or to be able to calculate long range trajectory.
  6. jmorris

    jmorris Well-Known Member

    I loaded for 20 years or so without one as a chronograph will not tell you if your load is over pressure. If anything they seem to tend folks towards going over pressure trying to make loads that go over pressure, trying to get "book speeds".

    Have a few now, use the base model shooting chrony more than the others because it stays in the truck.

    Don't even need to do anything fancy to chronograph at night.

    Last edited: Apr 26, 2013
  7. chaser_2332

    chaser_2332 Well-Known Member

    megnetospeed is the only chrono to have IMHO no worrys about the light conditions and they register everyshoot.

  8. readyeddy

    readyeddy Well-Known Member

  9. Blakenzy

    Blakenzy Well-Known Member

    I'm interested in that ProChrono^^^... just might buy it. Can anyone advise or comment on it's shortcomings before I pull the trigger?

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