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enviromental corrections-what do you use?

 
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Old 11-12-2013, 01:25 PM
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enviromental corrections-what do you use?

I would like to know how people here correct for environmental changes in the field.

Whatever you use share it.

If you use elevation. barometric, humidity, temp or if you ignore it as well.

Topic is open for internal or external ballistics.

What is the distance you feel comfortable with? Wind aside

Basically, any thing you do to correct for a one shot can't miss type shot.


Thanks!
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Old 11-12-2013, 10:28 PM
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Re: enviromental corrections-what do you use?

does anyone correct? Or just come up sheets?
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Old 11-12-2013, 11:42 PM
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Re: enviromental corrections-what do you use?

I could spend pages discussing the environment and long range shooting. Fortunately there are already some great books on this topic. I would suggest Applied Ballistics products. Buy a book or two, the environment is detailed to every aspect in Bryan's books.

BTW, don't be surprised if this thread is moved to another forum.
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Old 11-13-2013, 09:14 AM
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Re: enviromental corrections-what do you use?

Thanks. I study a lot about it and read a lot of Bryan litz info but I'm not trying to really learn it from this page. I am just wanting to know what people here do to correct. Or if they only feel comfortable out to say XXX yds I have been shooting lr seriously for about 6 years and studying envirometal changes hard for about 5. I'm no expert but I have seen a lot of people doing different things in those years. I have my ways of doing this that seems to work well but I might learn something from the guys doing it 10+ to 30+ years already. They might share one tool or method here that changes the way I look at the subject.

I wasn't real sure which forum it should go on but fiqured elr would be the right one as were discussing how to correct for shot that can be as long as you feel comfortable. If they move it my feelings wont be hurt lol.
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Old 11-13-2013, 02:04 PM
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Re: enviromental corrections-what do you use?

Quote:
Originally Posted by RobertB View Post
Thanks. I study a lot about it and read a lot of Bryan litz info but I'm not trying to really learn it from this page. I am just wanting to know what people here do to correct. Or if they only feel comfortable out to say XXX yds I have been shooting lr seriously for about 6 years and studying envirometal changes hard for about 5. I'm no expert but I have seen a lot of people doing different things in those years. I have my ways of doing this that seems to work well but I might learn something from the guys doing it 10+ to 30+ years already. They might share one tool or method here that changes the way I look at the subject.

I wasn't real sure which forum it should go on but fiqured elr would be the right one as were discussing how to correct for shot that can be as long as you feel comfortable. If they move it my feelings wont be hurt lol.
Fair enough!

I primarily use two methods to determine air density and wind corrections; a computer and firing tables.

For both the computer and tables I have learned to love using a Density Altitude air density equivalent for corrections. The Kestrel 4500 will take your temperature, Baro, humidity, and altitude and convert this data to a Density Altitude equivalent. I have found it much easier to use a ballistics application that will take DA to determine the air density and apply this to the program. Only one input vs. many. Simple is smart.

I also print my tables for every 1000 ft change in Density Altitude. As I hunt thru the day, I take out the appropriate DA table for the current environmental conditions. For example, 0 ft DA, 1000 DA, 2000 DA etc. Look at your Kestrel every now and then. If it says 3220 DA, I pull out my 3000 table and place it in my back pocket. I will change as conditions change throughout the day. I have found every 1000 change is sufficient and rounding to the nearest 1000 will provide the elevation correction results you need without too much of an error.

Now itís the wind uncertainty that predominately limits maximum hunting range. On my tables I will color code the ranges with high, medium and low wind confidence with green, yellow and red highlights. These are my maximum ranges based on uncertainty to within a 1 MPH full value cross wind (green), 2 MPH uncertainty (yellow), and 3 MPH uncertainty (red). If uncertainty is more than 3 MPH Iím not shooting past 400 yards period and most likely even closer.

Primarily I will use a computer for ballistics solutions, then validate off my tables. Garbage in on a computer equals garbage out. Anyone can have sticky fingers now and then. The tables validate the firing solution.

Hope this helps and good shooting.
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Old 11-13-2013, 02:43 PM
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Re: enviromental corrections-what do you use?

Awesome, this is what I'm looking for right here.

My setup is exactly like yours in every way. I use kestrel for DA carry a small PDA for unusal shots but I have arranged DA cards myself on rite in rain paper for the majority of shots.

I have recently starting collecting all enviro dada in my log book to see if some things really show a pattern but I've had great luck with nothing but DA. I understand that is actually the same thing but I like to know every single aspect of it. On another form they were saying how DA is good when you need to be fast when not shooting very far, but I have had great luck with nothing but DA.

I just came from West Texas/New Mexico to New York and got to setup a shot to mimic a shot I made out west.

The yardage was 1330 verified by GPS and Vectronix LRF. Angle was the same wind was actually very similar as well. Only thing that was different was the place I was shooting.

My calculations were dead on out west with a 15.1 mil in elevation.
It was logged and witnessed by my spotter.

Then came to new York and the calculation put me at 18.4 mil.
Knew that that was a huge difference but had a mountain as a backdrop and knew I was safe to find out. Shot and hit within a click of it. A second round confirmed this.I knew that I had proven the method to myself. I had checked it many times but had never gotten to go where the weather was so different while I had the same rifle to really know it across the country. I believe this Hodgon powder to do very good with different temps so I think I'm adjusting external ballistics mostly.

I know wind is the biggest factor but I'm glad you told me how you do it.
I hope there will be other ways of doing it and just wanted to see some of em.
Technology really helps out when shooting little bullets a long ways.

Thanks for the response.
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Old 11-13-2013, 07:09 PM
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Re: enviromental corrections-what do you use?

Quote:
Originally Posted by RobertB View Post
I have recently starting collecting all enviro dada in my log book to see if some things really show a pattern but I've had great luck with nothing but DA. I understand that is actually the same thing but I like to know every single aspect of it. On another form they were saying how DA is good when you need to be fast when not shooting very far, but I have had great luck with nothing but DA.
One caveat to consider when using DA and this can be important, Temperature Regression. If your powder requires temperature regression your program needs the powder temperature as an input. For most programs there is no way around entering a temperature if you select the DA option.

How do you get around this? Minimize temperature regression by zeroing your rifle in average temperatures most likely to be encountered during your hunting and record average MV. Zeroing in average hunting temperature serves two fold.

1) You are minimizing the powder temperature pressure differences which cause changes to your average muzzle velocity. If you are using less temperature sensitive powders and zero your rifle in average hunting temperatures this will eleviate this issue. Additionally to help with this issue, if it is significantly colder outside than your zero temperature you can place your ammo in a pocket close to your chest, drop your Kestrell in with that pocket and monitor the temperature. If the powder temperature is too cold or too hot simple move to a pocket closer or farther away from a body warm zone.

2) Harmonics. Don't you want to know how your rifle and ammo combo responds to specific conditions? At times my rifle POI and POA will change significant enough with a severe temp change to cause unnecessary errors at extended ranges.
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Last edited by MMERSS; 11-13-2013 at 09:12 PM.
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