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Recent content by colson

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    Advanced Marksmanship 175 Gr. Federal Gold Medal Match @ 750 yds

    Did you have someone spotting for you? That can make all the difference. Helps you figure out what you are doing wrong and what the wind is doing to your bullets. Also: Looks like you put maybe 100 rounds down range. That would be a lot of rounds to put down range, for me anyway, in one...
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    Range Report Whats Acceptable Grouping?

    1 MOA is certainly a worth goal. I like to keep it at .5 at 100, but after that I'm happy with 1 MOA. I'm no "target" shooter or competitor, though. I'm looking to maintain a realistic level(combat conditions realistic) of skill with the minimal amount of training that I get to do. The...
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    Range Report JBM dope card is screwing with me. Starting to get frustrated! What am I missing!?!

    93 yards or 107 yards, you will never see the difference. Sounds like you have a plan.
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    Range Report JBM dope card is screwing with me. Starting to get frustrated! What am I missing!?!

    This is the way ahead. Nail down the inputs; eliminate the swags and guesses. Eliminate human error as much as possible. Once you "get in the groove" it will all come together and the results will be repeatable.
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    Range Report JBM dope card is screwing with me. Starting to get frustrated! What am I missing!?!

    You can tweak the B.C., you can tweak the MV, you can re-fire and check your data (human error is a variable ever present). Remember, JBM or Shooter or whatever is just a prediction; what you see is reality. That said, these programs are pretty darn good now, but the inputs have to be spot on...
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    Range Report JBM dope card is screwing with me. Starting to get frustrated! What am I missing!?!

    Yes, a chrony is great, but if you are not correctly inputing the atmospheric data you are still going to be chasing your tail. My default is to ALWAYS use actual station pressure as measured by my watch barometer; that and the current temp and an estimated mv is all the data that I need to get...
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    Range Report JBM dope card is screwing with me. Starting to get frustrated! What am I missing!?!

    DO NOT check the PRESSURE IS CORRECTED BOX! When you use the station pressure, i.e., the actual barometric pressure at your location, you do not check that box.
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    Range Report JBM dope card is screwing with me. Starting to get frustrated! What am I missing!?!

    cofox: Your uncorrected pressure at 4800 ft is going to be right around 25.00. Enter that value and the temperature at the time of firing. Put humidity at 50%. Play with mv numbers until the result matches you observed DOPE.
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    Range Report JBM dope card is screwing with me. Starting to get frustrated! What am I missing!?!

    If you are at 4825 ft there is no way that your uncorrected pressure is 29.77.
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    Range Report JBM dope card is screwing with me. Starting to get frustrated! What am I missing!?!

    Actually, "Station Pressure" is the true, uncorrected pressure at a specific place.
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    Range Report JBM dope card is screwing with me. Starting to get frustrated! What am I missing!?!

    29.77 sounds like a corrected pressure for your altitude, thus clicking that box is the thing to do, if you want to use corrected pressure. My default is to always uncheck that box and enter the station pressure from my watch. If you do this then it doesn't matter what altitude you enter...
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    Range Report Firing Solution Tables

    It was a bit of a PITA, but worth it. Kestrels and the like are great, but a hard copy card is 10 X more practical in the field under practical (combat) conditions. These charts combine the best of both.
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    Range Report JBM dope card is screwing with me. Starting to get frustrated! What am I missing!?!

    damoncali: you seem to really know this subject; could you please take a look at my thread on Firing Solution Tables and let me know what you think? I think that my solution to the "book" or "multi-card" problem has a lot of potential. The basic premise of my tables is that there are only so...
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    Range Report Firing Solution Tables

    Here is something I came up to organize a lot of data in a small space. PDAs are great, but batteries go dead, can break, or simply be forgotten or lost. Analog ballistic computers are also great, but again, can be lost or forgotten. My tables can serve as a backup, or as a no-cost primary...
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    Range Report JBM dope card is screwing with me. Starting to get frustrated! What am I missing!?!

    damoncali called it: it's all about pressure and temperature. My Casio does both. You're going to see a huge spread in pressure if you are changing altitudes. I've even recorded pressure changes of one inch at my home depending on the weather, which is going to matter at longer ranges.
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