Long Range Hunting Online Magazine


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

Long Range Hunting & Shooting Nightforce Optics


Reply

Need help with "true velocity" for a drop chart

 
LinkBack Thread Tools Display Modes
  #8  
Old 07-31-2011, 02:52 PM
Junior Member
 
Join Date: May 2011
Posts: 26
Re: Need help with "true velocity" for a drop chart

I hadn't checked the scope movement but I just did that and it is right on (moved 25 inches with 25 MOA movement on the scope at 100 yards).
The terrain is flat (some hills around but actually shooting level). No wind to push the bullet up or down.
Reply With Quote
  #9  
Old 07-31-2011, 02:58 PM
Platinum Member
 
Join Date: Nov 2008
Location: SW Montana
Posts: 4,498
Re: Need help with "true velocity" for a drop chart

If you check your optic for like 20 MOA and it moves right on at 20 inches at 100 then your moving in IPHY not MOA which will catch you once you get out there and you will shoot low, just a possibility that has to be covered.
__________________
High Fence, Low Fence, Stuck in the Fence, if I can Tag it and Eat it, it's Hunting!

"Pain is weakness leaving your body"
Reply With Quote
  #10  
Old 07-31-2011, 03:19 PM
Junior Member
 
Join Date: May 2011
Posts: 26
Re: Need help with "true velocity" for a drop chart

correct. I just learned that little piece of information. It should have moved 26.175" not 25". I reran the numbers but I still have a calculated velocity difference of about 200 fps. The close range gives me 2872, the far range gives me 2695.
Reply With Quote
  #11  
Old 07-31-2011, 03:33 PM
Platinum Member
 
Join Date: Feb 2007
Location: Townsend, Montana.
Posts: 7,900
Re: Need help with "true velocity" for a drop chart

What scope? Sounds like a tracking issue to me.

Jeff
__________________
Reply With Quote
  #12  
Old 07-31-2011, 03:37 PM
Platinum Member
 
Join Date: Feb 2007
Location: Townsend, Montana.
Posts: 7,900
Re: Need help with "true velocity" for a drop chart

Ok,

200 yard zero,

180 Berger

Conditions Wind none, temp 65, pressure 25.20, elevation 4950.


Scope height above bore?

Give us your actual needed dial ups you have confirmed and their exact distances. I assume you shot at least 3 shots to comfirm each?

Jeff
__________________

Last edited by Broz; 07-31-2011 at 03:41 PM.
Reply With Quote
  #13  
Old 07-31-2011, 06:26 PM
Junior Member
 
Join Date: May 2011
Posts: 26
Re: Need help with "true velocity" for a drop chart

scope height 1.75" (leupold VX 3, 4.5-14)

zero 200 yards
465 yards, 27 clicks (6.75 MOA) 5 shot group, 5.1 " high
753 yards, 64 clicks (16 MOA) 5 shot group 2.8" low
Reply With Quote
  #14  
Old 07-31-2011, 07:01 PM
Platinum Member
 
Join Date: Feb 2007
Location: Townsend, Montana.
Posts: 7,900
Re: Need help with "true velocity" for a drop chart

Quote:
Originally Posted by kudu View Post
scope height 1.75" (leupold VX 3, 4.5-14)

zero 200 yards
465 yards, 27 clicks (6.75 MOA) 5 shot group, 5.1 " high
753 yards, 64 clicks (16 MOA) 5 shot group 2.8" low
No rail base? The scope height numer looks low.

I will run some numbers and report back.

Jeff
__________________
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Similar Threads for: Need help with "true velocity" for a drop chart
Thread Thread Starter Forum Replies Last Post
For those of you "drop chart guys" Nikolakangrga Long Range Hunting & Shooting 2 03-31-2011 09:12 AM
What are "break velocity" and "retard. coeffic. rate"? Monkeyleg Rifles, Bullets, Barrels and Ballistics 1 01-02-2011 12:14 AM
You're favorite "woods gun"? mine proved true today goose Deer Hunting 53 05-11-2010 07:41 PM
"True Ballistic Range" with Leupold rangefinder Bob33 Long Range Hunting & Shooting 2 08-17-2009 11:43 PM
New "true" time of flight device. What do you all think? Michael Eichele Rifles, Bullets, Barrels and Ballistics 11 04-10-2009 09:53 AM


All times are GMT -5. The time now is 04:30 AM.


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