Ballistic stock cards

Jager

Jager

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Nanaimo
Alright, I'm going to plead ignorance right off the start. I'm curious about the ballistic cards some guys tape to their stocks. I have no experience with them and am interested in developing one for my .270 win. I also admit that in my hunting career most of my shots have been under 100 yrds and know the .270 is capable of so much more.

Please educate me.
 
I have the elevation settings for the different ranges, use a self adhesive label. You will have to zero the rifle at different ranges to obtain the settings.
 
Couple ways you can do it. Type in the required info like bullet,velocity, etc into a ballistic program then print it off or head out to a range and start shooting. The first way is the best. If you have an iphone or itouch you can buy the program for about 10 bucks. I have one and use it with my .308. It is pretty accurate and easily pays for itself. If you use factory ammo I or someone else to give you a rough table that you would have to head out to the range and test.
 
Here's what I use for mine and it is the most accurate I have found for Trajectory cards.

http://www.jbmballistics.com/~jbm/cgi-bin/jbmucard-5.0.cgi

I copy the output into Excel and color code each range or make every other line a light grey so that I can make sure I am reading the correct line. You can make them business sized and print 3-6 to a page depending on the size.

I use packing tape to "Laminate" tham and keep them in my range book.
 
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I have been stumped on why my range cards aren't as accurate, they're usually off about 1 MOA or so for any given range. Calculations vs. actual are close but not exact as I expect.
I try to enter actual numbers from load testing... bullet, velocity, temp., atmosheric pressure etc.
Is it normal? It's awesome as they usually get on paper on the 1st shot.
 
Sometimes scopes don't click as advertised, sometimes the range is wrong, sometimes the muzzle velocity is wrong. Then there is cold zero vs. warm zero, using too few shots to find group centre. You know which of these don't apply in your case, naturally.
 
Maqaiti said:
I have been stumped on why my range cards aren't as accurate, they're usually off about 1 MOA or so for any given range. Calculations vs. actual are close but not exact as I expect.
I try to enter actual numbers from load testing... bullet, velocity, temp., atmosheric pressure etc.
Is it normal? It's awesome as they usually get on paper on the 1st shot.
Click to expand...

You always have to verify the shots. They are usually good enough to get you real close.
 
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