close
Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Rifles, Reloading, Optics, Equipment > Rifles, Bullets, Barrels & Ballistics

Rifles, Bullets, Barrels & Ballistics Applied Ballistics

Reply

Bullet flight path

LinkBack Thread Tools Display Modes
  #1  
Unread 10-17-2004, 06:33 PM
Bronze Member
 
Join Date: May 2003
Location: Wausau, WI
Posts: 47
Bullet flight path

My local range only has targets out to 300 yards. I have a 100 yd zero and my come up for 300 is about 2.7 MOA. I asked to shoot on a farmers field to 500 yds. My come up and 400 is 6 MOA and 500 yds is 9.6 MOA. The bad part is I don't know my velocity. I am shooting 200 accubonds with 91 gr of H-1000. My book velocity should be close to 3000 fps. According to my actual values to the caculated I am more than a 1 MOA off at 500 yds. Is this typical? [img]images/icons/confused.gif[/img] [img]images/icons/frown.gif[/img]
__________________
Follow the 7 p's and everything will be alright
Reply With Quote
  •   #2  
    Unread 10-17-2004, 10:01 PM
    Bronze Member
     
    Join Date: Aug 2004
    Location: Arizona Mountains
    Posts: 50
    Re: Bullet flight path

    Craig

    When you say "calculated" I assume you mean one of the ballistic programs. The short answer is, yes, you could be that much off if you don't know the velocity. That's one of the critical numbers in your input data. Ballistic programs are not perfect. If you have actual come-ups you have to trust them and not some program numbers.
    Reply With Quote

      #3  
    Unread 10-18-2004, 06:15 AM
    Bronze Member
     
    Join Date: May 2003
    Location: Wausau, WI
    Posts: 47
    Re: Bullet flight path

    cheechako,

    I just didn't think that the ballistic programs would be that far off at 500 yds already [img]images/icons/shocked.gif[/img] I gues that my next shooting gadget should be a chronograph.
    __________________
    Follow the 7 p's and everything will be alright
    Reply With Quote
      #4  
    Unread 10-18-2004, 06:16 AM
    Bronze Member
     
    Join Date: May 2003
    Location: Wausau, WI
    Posts: 47
    Re: Bullet flight path

    The caculated velocity was taken from the Nosler manual
    __________________
    Follow the 7 p's and everything will be alright
    Reply With Quote
      #5  
    Unread 10-18-2004, 08:46 AM
    700 700 is offline
    Silver Member
     
    Join Date: Jun 2002
    Location: Ireland
    Posts: 138
    Re: Bullet flight path

    Craig

    I assumed the following for your situation.

    Min. Possible Velocity : 2700 fps
    Max. Possible Velocity : 3300 fps

    Min. Possible G1 BC : 0.45
    Max. Possible G1 BC : 0.6

    Scope Height = 1.5 inches

    Standard Athmospheric Conditions

    Using some computer code I wrote over the weekend, and a method of least squares, I found that a G1 BC of 0.45 and an MV of 2970 fps suits your drop data quite well.

    These values may not even be close to your true BC or Muzzle Velocity but they should produce a pretty decent drop chart from a ballistics program,which will match the data you gave us quite well.


    Range Yrds,,Drop In,,Drop MOA
    100,0,0
    200,-2.70527,-1.29167
    300,-10.6921,-3.40342
    400,-25.3806,-6.05917
    500,-48.6858,-9.29832

    Using this
    You will be on target at 100 yards.
    You will be 0.8 MOA low at 300 yards.
    You will be 0.059 MOA low at 400 yards.
    You will be 0.3 MOA high at 500 yards.

    Hope this helps

    Regards

    700
    Reply With Quote
      #6  
    Unread 10-18-2004, 08:57 AM
    700 700 is offline
    Silver Member
     
    Join Date: Jun 2002
    Location: Ireland
    Posts: 138
    Re: Bullet flight path

    Craig, Cheechako

    It is well to remember that ballistics programs can only approximate a bullets flight path.

    The G1 ballistic coefficient which most programs use was origionally developed for a particulat projectile. The G1 BC will work great if you you are shooting that particular projectile, but less well, the more different your projectile is from the origional intended projectile.

    Rgds

    700
    Reply With Quote
      #7  
    Unread 10-18-2004, 09:09 AM
    Bronze Member
     
    Join Date: May 2003
    Location: Wausau, WI
    Posts: 47
    Re: Bullet flight path

    700,

    thanks for the drop chart. My scope height is 1.8" how did you develop that caculation?
    __________________
    Follow the 7 p's and everything will be alright
    Reply With Quote
    Reply

    Bookmarks

    Thread Tools
    Display Modes


    Similar Threads for: Bullet flight path
    Thread Thread Starter Forum Replies Last Post
    Down draft effects on bullet flight ? bigngreen Rifles, Bullets, Barrels & Ballistics 4 10-25-2010 02:18 PM
    how does rain affect bullet flight? AtownBcat Rifles, Bullets, Barrels & Ballistics 6 09-08-2010 08:02 PM
    Bullet Flight djtjr Long Range Hunting & Shooting 0 06-03-2010 03:24 PM
    Knights Armament Bullet Flight Software Question jda2631 Long Range Hunting & Shooting 1 02-28-2010 04:05 PM
    Ballistic FTE & KAC Bullet Flight Question jonthomps Rifles, Bullets, Barrels & Ballistics 5 09-28-2009 07:59 PM


    All times are GMT -5. The time now is 03:06 AM.


    Powered by vBulletin ©2000 - 2017, Jelsoft Enterprises Ltd.
    Content Management Powered by vBadvanced CMPS
    All content ©2010-2015 Long Range Hunting, LLC