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Drag Functions

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Unread 12-29-2006, 01:40 AM
Silver Member
Join Date: Aug 2006
Location: Hatchet City, AB,Canada
Posts: 232
Drag Functions

Can anyone explain the drag functions on ballistic calculators??

I ussually use the G1 function but I'm not sure if this is correct.


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Unread 12-29-2006, 08:46 AM
Platinum Member
Join Date: Jan 2003
Location: The rifle range, or archery range or behind the computer in Alaska
Posts: 3,830
Re: Drag Functions

To get an accurate trajectory drop chart, it takes two numbers. BC and drag function. G1 is the most common. If you dont have real world drop data to compare your calculator results to, use G1. If you have real world results say at 300, 600, 800 and 1000 yards and even more imbetween, then if G1 and any BC combo doesnt match, then you try G5 and a lower or higher BC. If that still doesnt match, yoy try G7 and a lower or higher than G1 BC. Sooner or later, it will match. Many combo's will get you an accurate 1000 yard drop, but your calculator may have the mid range points higher or lower than your real world drops if youre not using the right drag function. They are also very unpredictable. YOU MUST test your rifle load combo to get your calculator to give you accurate results. So you ask, what is the point of a calculator? The point of them is so that after you have established a real world BC and drag function, it will show you predictable changes when the air density changes.

Clear as mud??
Long range shooting is a process that ends with a result. Once you start to focus on the result (how bad your last shot was, how big the group is going to be, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.
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