I want to make one of these

[tango6]

http://www.snipercentral.com/shop/popup_image.php?pID=621

What do I need, I know I need the grain amount of the projectile, the brass, the amount of powder,barrel length, or does anyone have one with the information from southwest ammo and using a 5R with a 20 inch barrel?

 

[OutlawTen5]

Re: I want to make one of these

www.jbmballistics.com

It's only as good as the info you enter, so make it count. You'll need to enter your true muzzle velocity and height over bore, etc.

Or better yet, go to www.actsvirginia.com and order yourself the FDAC (Under PRODUCTS)

 

[sled_mack]

Re: I want to make one of these

I've got the FDAC. It's great. But this may be an improvement on it:

http://www.snipershide.com/forum/ubbthreads.php?ubb=showflat&Number=3299815#Post3299815

Same company, just a different format and (I think) more bullets in the database.

 

[Redmanss]

Re: I want to make one of these

First off, you need to know your velocity. You can use the baseline velocity from the ammunition manufacturer to get you close, but it's still a SWAG. Get a chronograph; they're not that expensive but the data you gain from it is immensely important.

The next thing you will need is your projectile's ballistic coefficient. These are really easy to come up with from a quick search.

Next you will need your environmental data to calculate your density altitude and finally apply that to a drop chart. Without going too far into that, read the articles in the link below. Lindy spells them out much better than I can.

http://www.arcanamavens.com/LBSFiles/Shooting/Downloads/References/

Also, the Field Density Altitude Compensator (FDAC) is an excellent tool for having the data already written out in a durable and versatile slide ruler. Find them or the new IDB/ACTS Adaptive Quick Cards at the Impact Data Books link below.

http://www.impactdatabooks.com/Adaptive_Quick_Card_AQC_s/149.htm

http://www.impactdatabooks.com/Tools_s/128.htm

Finally, you really need an understanding of external ballistics to really make use of all the information out there. Bryan Litz's book "Applied Ballistics for Long-Range Shooting" is one of the best single source books in print on the subject.

http://www.appliedballisticsllc.com/index_files/Book.htm

To play the game, you have to know the rules... In this case basic physics.

 

[Rob01]

Re: I want to make one of these

As I wrote over at AR15.com, You need to know the bullet and velocity mostly but also scope height above bore and the environmental conditions. Go to JBM Ballistic Calculators and use the Trajectory-Simplified. Will give you all the info you need. Don't worry about Line of Sight angle and Cant angle boxes. Just leave them as they are. Pick your bullet out of the library and put in the rest of the info. If you use Mils then get the data in Mil and MOA get it in MOA. Not inches or cm.

 

[gunny]

Re: I want to make one of these

Link to Lindy's article does not work

Thanks

 

[Redmanss]

Re: I want to make one of these

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: gunny</div><div class="ubbcode-body">Link to Lindy's article does not work

Thanks </div></div>I don't know why it isn't working for you, but I linked it to the main menu of all the articles he has. You can try this one too: Making Ballistic Cards Using Density Altitude

 

[unluckyjohn]

Re: I want to make one of these

tag

 

[9H_Cracka]

Re: I want to make one of these

You can make your own using a spreadsheet program then have it laminated at Kinkos for cheap. Heck a standard printer with card stock and heavy duty packing tape does a great job as well.

 

[roggom]

Re: I want to make one of these

I like LRBC from G7. Very easy to use and you do not need a chrono. Just select your bullet and weight, enter approx velocity then spit out a drop chart. Go to the range and validate, and the software will adjust the velocity or BC to give a true chart.

You can print out a drop table or drop chart. The complete has drops at different temps, elevations, angles etc. They print out darker, but this is a print to xml to bitmap to jpg and so on.

By roggom at 2012-05-12

http://www.gseven.com/home

http://www.vortexoptics.com/content/lrbc_tutorials


Fits perfectly in one of John's ammo burritos

By roggom at 2012-05-12

 

[Muttt]

Re: I want to make one of these

Have you talked to southwest ammo? They may already have that info. Then all you would have to do is shoot to verify the info.