I ve completed my first round of sniper 101 amd have built my first set of charts. I ve rewatched several episodes and feel like I have a firm grasp on computing a firing solution. Where I live at in south dakota i have only 650 yrds at my convience and with an altitude of 1250. When i travel to go back home to Wyoming in a couple months i am going to get to stretch my legs on the family ranch. The altidude there will be about 6000 feet. Will just my barrometric pressure corrections fix this difference? I ll have my magnetospeed along and collect data for that location but i want to showup with as much info as i can. Could you please share with me your dope, data and corrections and experiences with such changes. Thank you
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linemancaseysmith
Jan 22, 2018
Altitude corrections
Altitude corrections
0
If you are measuring absolute barometric pressure, you can use that find your correction value. The absolute barometric pressure for 6000' should be around 24.00 inHg. If the pressure you are seeing is more in the 29-31 range, you are looking at a corrected "station pressure" which won't account for the altitude difference.
How you apply this will depend on how the charts are set up. If you follow Rex's videos from a few years back he will show you that you need to create a chart for each air density altitude you plan to operate in. So if you're at sea level you would want a chart for about 30.00 inHg, and perhaps one for each 1" in mercury change, all the way up to 24 inHg.
When you get to your firing position, read the absolute pressure on your device (make sure it it calibrated to display absolute pressure, not corrected pressure) then use the chart that is closest to that pressure, or interpolate the values between the charts.
If you haven't yet downloaded and played with the ballisticxlr's spreadsheets, you need to. Just spending a day studying these can teach you a lot on how to apply corrections. Of course you need to make sure all of your inputs are correct.
Hope that helps!
As mentioned above make sure that all data is correct. Also if shooting at an angle through another pressure change account for this also Rex has you covered. Watch his episode on his calc form this will help you build the charts for primary and secondary ballistic data. Fun stuff
Yes very fun! And challenging! Thanks for the input! Mecca Streisand had to bail me out some incorrect data entries already!
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