Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Hunting > Long Range Hunting & Shooting

Long Range Hunting & Shooting Nightforce Optics


Reply

Adjusting Drop chart to real World Results

 
LinkBack Thread Tools Display Modes
  #8  
Old 11-13-2011, 09:53 AM
SPONSOR
 
Join Date: Mar 2007
Posts: 482
Re: Adjusting Drop chart to real World Results

Ballistic Program Inaccuracies
__________________
Bryan Litz
Ballistician

Author of: Applied Ballistics for Long Range Shooting
And: Accuracy and Precision for Long Range Shooting

Reply With Quote
  #9  
Old 11-18-2011, 10:12 PM
Gold Member
 
Join Date: Aug 2005
Location: Mouth of Hobble Crk Canyon, Utah
Posts: 571
Re: Adjusting Drop chart to real World Results

Scott,

You never did say how far off your drops were.

This past summer, I discovered something about my Shooter program on my DROID that had me pulling my hair. I won't go into details but it had to do with station barometric pressure vs standard pressure for a known altitude. Put me 2 MOA off. I started to play the numbers with the BC or velocity and it just didn't jive. That's when I went back to my input values and discovered "my" GIGO mistake; Garbage In, Garbage out!

Alan
Reply With Quote
  #10  
Old 11-19-2011, 09:58 AM
Platinum Member
 
Join Date: Jan 2008
Location: Northeast
Posts: 2,198
Re: Adjusting Drop chart to real World Results

I believe that it is quite common to have to make corrections for a particular rifle load combo when working with standard ballistic programs. I have had good success with the calculator on the Best of the West site. I am sure there are other programs that do this, but the program provides for the correction of the actual impact points at long range and then enables you to determine a very precise ballistics chart. It then will provide an output that show either a "true velocity", or a "true ballistic coefficient". You can choose which one. My personal approach is to get the true ballistic coefficient since I am pretty confident in my velocity readings that I confirm on multiple set ups. I can then plug my true ballistic coefficient into my I phone FTE calculator which then will coincide and produce the same ballistic info, or use the data to make a ballistic turret.
__________________

"Let us speak courteously, deal fairly, and keep ourselves armed and ready"-T. Roosevelt
Reply With Quote
  #11  
Old 11-19-2011, 11:06 AM
Silver Member
 
Join Date: Dec 2007
Location: Central, KY
Posts: 336
Re: Adjusting Drop chart to real World Results

Quote:
Originally Posted by Alan Griffith View Post
Scott,

You never did say how far off your drops were.

This past summer, I discovered something about my Shooter program on my DROID that had me pulling my hair. I won't go into details but it had to do with station barometric pressure vs standard pressure for a known altitude. Put me 2 MOA off. I started to play the numbers with the BC or velocity and it just didn't jive. That's when I went back to my input values and discovered "my" GIGO mistake; Garbage In, Garbage out!

Alan
I'm off by about .5 moa.
__________________
Thanks,
Scott
Reply With Quote
  #12  
Old 11-19-2011, 02:41 PM
Gold Member
 
Join Date: Aug 2005
Location: Mouth of Hobble Crk Canyon, Utah
Posts: 571
Re: Adjusting Drop chart to real World Results

Quote:
Originally Posted by scsims View Post
I'm off by about .5 moa.
Scott,

Could that be as simple a fix as adjusting your zero .5 moa?

Alan
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Similar Threads for: Adjusting Drop chart to real World Results
Thread Thread Starter Forum Replies Last Post
drop chart and chronograph drop chart sdriverbottom Long Range Hunting & Shooting 24 11-01-2011 12:27 PM
real world 243 velocities marky123 Reloading 1 06-07-2011 07:30 PM
Real World BC berger .25? nitrousmudbogger Rifles, Bullets, Barrels and Ballistics 23 04-08-2011 10:41 PM
Ballistic chart just don't match the real world. Need some help. 4ked Horn Rifles, Bullets, Barrels and Ballistics 10 11-10-2006 12:19 PM
Are you Real World Deployable Dave King Long Range Hunting & Shooting 7 03-17-2004 12:17 AM

Current Poll
Do you plan to buy a new custom rifle in the next 12 months?
YES - Of course - 73.08%
1,553 Vote
NO - wife/girlfriend won't let me. - 26.92%
572 Votes
Total Votes: 2,125
You may not vote on this poll.

All times are GMT -5. The time now is 04:51 AM.


Powered by vBulletin ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Management Powered by vBadvanced CMPS
All content ©2010-2014 Long Range Hunting, LLC