close
Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Chatting and General Stuff > General Discussion

General Discussion Must wear red or OD green socks to participate. I can't see your socks, please be honest.

Reply

ballistic help

LinkBack Thread Tools Display Modes
  #1  
Unread 03-04-2007, 07:30 PM
Platinum Member
 
Join Date: Nov 2005
Location: Riggins Idaho
Posts: 1,195
ballistic help

Hello, I got a problem. I was just trying to get a rough drop chart to get so I dont have to use so many bullets creating a real drop chart. I live at about 2500ft. It was about 40degrees and I was shooting a 7mmstw with an 162gr. amax. I was zerod at 100. At 415 it had dropped 17clicks 4.25moa, then at 1100 it dropped about 106clicks 26.5moa. If any of that is wrong please tell me. can some one email me chart to get me close for drops. I dont know exactly how fast they are either. If anyone could help I would be appreciative.
__________________
I dont know who ever came up with the imaganary word of "Over Gunned"
Reply With Quote
  •   #2  
    Unread 03-04-2007, 07:47 PM
    SPONSOR
     
    Join Date: Feb 2007
    Location: Buffalo, Wyoming
    Posts: 1,707
    Re: ballistic help

    what velocity ? what sight above bore height ?

    Or can you tell me what your load is, so we can get close to the velocity ?

    let me know and I'll shoot ya a drop chart.... [img]/ubbthreads/images/graemlins/grin.gif[/img]
    __________________
    Lightforce Lights Dealer
    Reply With Quote

      #3  
    Unread 03-05-2007, 07:39 AM
    Platinum Member
     
    Join Date: Nov 2005
    Location: Riggins Idaho
    Posts: 1,195
    Re: ballistic help

    what the reloading manual said is that i should be getting around 32-3250 I believe. dont have it with me. I dont know on sight above bore height either. it has nightforce rings and bases 56mm objective. How do you measure that? thanks
    __________________
    I dont know who ever came up with the imaganary word of "Over Gunned"
    Reply With Quote
      #4  
    Unread 03-05-2007, 08:27 AM
    Official LRH Sponsor
     
    Join Date: Jun 2004
    Location: Fort Shaw, Montana
    Posts: 6,847
    Re: ballistic help

    Most conventional factory receivers are 1.350" in diameter, roughly.

    Then measure your base thickness and the distance from the top of the base to the bottom of the scope tube.

    THen if your using a scope with a 1" tube add 1/2" to this, if your using a 30 mil scope add 0.591".

    So you have 1/2 the receiver diameter+base height+ring height+1/2 scope main tube diameter.

    That will get you your measurement for height above the bore.

    TO be honest, if you use 1.5" for most conventional scopes mounted in the proper location and 1.7" for the big 56mm objectives, you will be extremely close in most cases.

    If you are using published load data, I would say there is a good chance your no where near 3200-3250 fps. YOu really need to shoot your load over a chrono so you know for sure. This is really critical for accurate shot predicting at long range.

    Kirby Allen(50)
    __________________
    Kirby Allen(50)

    Allen Precision Shooting
    Home of the Allen Magnum, Allen Xpress and Allen Tactical Wildcats and the Painkiller Muzzle brakes.

    Farther, Faster and Flatter then ever before.

    Web Page: www.apsrifles.com

    allenmagnum@gmail.com
    Reply With Quote
      #5  
    Unread 03-05-2007, 09:01 AM
    CAM CAM is offline
    Silver Member
     
    Join Date: Jan 2002
    Location: Utah
    Posts: 385
    Re: ballistic help

    screech
    as everyone else said it would just be a guess!!
    you ask for a rough drop

    7mm STW 162gr A-max BC 0.625

    3200 fps zero at 100yds

    scope 1.5 altitude 2500 40 deg

    range MOA
    100 0
    200 2.2
    300 4.9
    400 4.65
    500 6.76
    600 9.06
    700 11.54
    800 14.23
    900 17.14
    1000 20.29
    1100 23.70
    1200 27.41

    Exbal calculator

    CAM

    Edit to add
    to be zero at 100 and drop 26.5 MOA at 1100
    using all the above info your speed is 3050 FPS
    and your 400 yard would be 5.25 MOA
    Reply With Quote
      #6  
    Unread 03-05-2007, 11:35 AM
    Platinum Member
     
    Join Date: Nov 2005
    Location: Riggins Idaho
    Posts: 1,195
    Re: ballistic help

    Thanks cam. I used an online ballistic calculator and couldn't get it to hit accurately on 415 and 1100 either. I know that is what I had to come up to hit but it dosent work for some reason. I tried changing velocity, elevation, bc and couldn't get it.

    Thanks Kirby, I dont know why I didn't think of that. I will try and run it over a chrony and see what it says when I have time.
    __________________
    I dont know who ever came up with the imaganary word of "Over Gunned"
    Reply With Quote
      #7  
    Unread 03-05-2007, 08:22 PM
    Platinum Member
     
    Join Date: Nov 2005
    Location: Riggins Idaho
    Posts: 1,195
    Re: ballistic help

    hey cam, what ever you used can you do it again but give it to me in every 25yrd increments. I think you about hit it on top of the head. thanks
    __________________
    I dont know who ever came up with the imaganary word of "Over Gunned"
    Reply With Quote
    Reply

    Bookmarks

    Thread Tools
    Display Modes


    Similar Threads for: ballistic help
    Thread Thread Starter Forum Replies Last Post
    Ballistic Gel Festus Rifles, Bullets, Barrels & Ballistics 14 11-04-2009 12:16 PM
    Ballistic tip 168?? lg Rifles, Bullets, Barrels & Ballistics 3 06-23-2009 11:59 AM
    ballistic pda tjonh2001 Equipment Discussions 2 12-07-2007 09:01 PM
    ballistic mil-dot mooser Long Range Scopes and Other Optics 7 01-27-2007 10:21 PM
    combined tech. ballistic silver tip /Nosler ballistic tip winmagman Rifles, Bullets, Barrels & Ballistics 3 10-27-2003 06:26 PM


    All times are GMT -5. The time now is 07:21 PM.


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