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Author Topic: Altitude  (Read 233 times)

Offline BoBallistic

  • 14 Point
  • Join Date: Oct 2009
  • Posts: 5251
  • Location: Tennessee
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Altitude
« on: June 01, 2014, 07:12:52 PM »
To continue the discussion about Elevation and its effects on bullets, I thought I would add another chart that may help folks here on TH

Many years ago (to many to count), I notice that most Ballistic Coefficients are base on Sea Level! That's funny, I don't hunt at Sea Level or anywhere near the Sea, except small deer or hogs on Sapelo or Ossabaw Island off the Georgia coast.

After flying all over these United States and listening to the pilot telling the passengers that it is minus 50 outside and we are cruising at 33K feet because if more efficient to do so..I also reading and re-reading my Sierra Reloading Manuals and somewhere along the way, the light bulb in my head came on. 

Most bullet manufacturers calculated their Ballistic Coefficients (BC) at Sea Level. There are a few who state the BC are taken at their plants where they do the testing at. So be sure to check the bullet or ammo website to see if you can obtain this information. It is very important that you do.

Basically the higher you go in the Rockies, the more efficient you bullet becomes. Attached is an abbreviated chart in PDF format. My working chart is broken down in increments of 100 ft. But the attached on is 500 ft and a 1000 ft change. The highest the chart goes to is 10000 ft. If you hunt any higher you are going to need oxygen!

Hope this helps......
« Last Edit: June 01, 2014, 07:17:42 PM by BoBallistic »
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