Windage charts for .308 155gn Sierra MK?

[Reg Curtis]

Anyone got any, or seen any, windage charts/tables/calculators for .308 155gn Sierra MK (300-1000 yards)?

 

[Ned Ludd]

If you know your muzzle velocity with the 155s, it's pretty simple to make your own:

http://www.jbmballistics.com/cgi-bin/jbmtraj_simp-5.1.cgi

Someone else's chart may or may not closely match your specific windage values, depending on their muzzle velocity, elevation, atmospheric conditions, etc.

 

[rardoin]

Anyone got any, or seen any, windage charts/tables/calculators for .308 155gn Sierra MK (300-1000 yards)?

Miller and Cunningham's book, 'Wind reading for rifle shooters' has tables for a 155gr in .308 Palma load. It may, or may not, match your velocities.

 

[Reg Curtis]

The JBM Ballistics page is more about ballistics and less about wind drift; true it gives the 90 degree deviation, but that’s all, which is not easy to convert when lying on the firing point with 2 minutes before competition start. I’m looking for a quick and easy reference chart or table that shows estimated wind deviation by flag levels (or wind speeds) by ranges (300, 500, 600, 900 & 1000 yards), preferably diagrammatic. The sort of thing you see on the bottom of some plot sheets, but not the free download ones.

Has anyone seen such a thing for .308 (7.62x51) 155gn bullets at a MV around 2.8-3.0k FPS?

 

[Reg Curtis]

I was looking for a free download to laminate and add to my scorebook for quick reference on the range. The Miller and Cunningham book is over 100 quid on that well known e-tailer that this forum won’t allow you to mention (for the paperback edition), which is too excessive.

 

[Laurie]

In this country (the UK) You used to be able to buy a simple cardboard 'computer' where you set the wind condition with one tab then turned a disk to get MOA of windage at every range from 200 to 1,000. I have one somewhere in my house but haven't seen it in years. Sold by people like Fulton's of Bisley and A J Parker to British 7.62 TR (sling) shooters. Very handy, better than any app in my obsolete steam-age old-f*rt view!

I bet US Fullbore competitors and Canadian / Australian / New Zealand sling shooters had their local versions too.

Here's a modern version I found through Google for Ar-shooting XTC competitors

https://www.guns.com/news/2011/03/21/a-cardboard-computer-for-long-shots-absolutely

 

[Reg Curtis]

Yes, I had one when I started shooting but it's long gone, I can't find anyone punting the cardboard computer anymore specifically for .308 for 300-1000 yards, not even on that site that this forum won't allow you to mention but operates the world's largest second hand market place......

 

[wkdickinson]

Buy the "Shooter" app from the Play Store and create your own charts with Excel from your data.

 

[243Mendoza]

try this

 

[Reg Curtis]

Perfect! Much obliged to you, do you have the same for 300, 500 and 600 yards by any chance?

 

[Bindi2]

Look up ggrc.asn.au go to media & articles.

 

[mike06]

Try Strelok Pro it is android app I used the free version for years. It has large data base of bullets and scopes.

http://www.borisov.mobi/StrelokPlus/default.asp

 

[JFrank]

try this

Ya got one of those for a 6 BR at 2830 FPS ?

 

[243Mendoza]

Perfect! Much obliged to you, do you have the same for 300, 500 and 600 yards by any chance?

Here it is. I had to modify the inputs because the JBM data for the Sierra 155 Palma (2156) had changed since I last made the spreadsheet. I also increased the velocity to 3000fps since this seems to be now the standard velocity for this bullet in Palma rifles.

 

[243Mendoza]

Ya got one of those for a 6 BR at 2830 FPS ?

SPJ, if you are familiar with Excel, you can modify the input for the spreadsheet that I provided Reg Curtis. Using JBM and filling the details for your bullet and velocity (http://www.jbmballistics.com/cgi-bin/jbmtraj_drift-5.1.cgi) and a 90deg wind velocity of 10mph, use the wind drift values given by JBM as input to the spreadsheet (column next to the yard lines). If you need help, let me know.

 

[Reg Curtis]

Steve, Many thanks, very useful...

 

[ballisticxlr]

https://ballisticxlr.com/ballisticxlr-support/ and scroll down for downloads, everything is free and it generates a super handy column of wind data for multiple temperature regimes. At the long end temp will matter just enough to pay attention to.

 

[r bose]

http://champchoice.com/store/Main.aspx?p=ItemDetailOptions&item=CC0064

Used these for years. unfortunately only printed and laminated for 800,900, 1000 yards