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

temperature to velocity variation input

LinkBack Thread Tools Display Modes
  #1  
Unread 07-01-2006, 12:38 PM
Junior Member
 
Join Date: Aug 2001
Posts: 22
temperature to velocity variation input

Anyone have any info on temperature variation with different powders..

Example, a 243, 6mm, 257, 25-06, 270,7mm 30-06, 300's etc using Re-19-22-25 or IMR-4831 4350 etc
from a cold 20-25 deg day (what vel do you get?), on up to 60-70 deg (what vel do you get now).

I have not done enough testing myself to make anything yet, I'd like to know how ball powders compare to stick powders from 20-70 deg or something around that. have any of you have done any temperature to velocity testing?

scott
Reply With Quote
  •   #2  
    Unread 07-01-2006, 05:51 PM
    Platinum Member
     
    Join Date: Jan 2004
    Location: Blackfoot, Idaho
    Posts: 8,859
    Re: temperature to velocity variation input

    58.9gr RL-22 270Win 27" bbl = 3200 FPS on 70/80 degree summer day. When in 90s, don't shoot that load.

    Same load in fall/winter @ about freezing is 130 FPS less.
    __________________
    I may be the slowest guy on the mountain . . . . but . . . . I'm on the mountain!
    Reply With Quote

      #3  
    Unread 07-01-2006, 08:28 PM
    Platinum Member
     
    Join Date: Feb 2004
    Location: Pennsyltucky
    Posts: 2,630
    Re: temperature to velocity variation input

    i think most concentrate on how much extra powder they need to get the same velocity when it's cold rather than how much slower it is.
    __________________
    davesonlinedeals.com
    Reply With Quote
      #4  
    Unread 07-02-2006, 12:58 PM
    Platinum Member
     
    Join Date: Jan 2004
    Location: Blackfoot, Idaho
    Posts: 8,859
    Re: temperature to velocity variation input

    [ QUOTE ]
    i think most concentrate on how much extra powder they need to get the same velocity when it's cold rather than how much slower it is.

    [/ QUOTE ]

    Dave,

    I do that also. This was an unintended discovery. I 'just happened' to shoot over the chrono on a very cool day for no good reason at all. I was suprised that the velocity difference was that large. Still shot good though. But needed a new drop chart for cool weather shooting. I'm not trustworthy enough to keep a load for each season. [img]/ubbthreads/images/graemlins/frown.gif[/img]
    __________________
    I may be the slowest guy on the mountain . . . . but . . . . I'm on the mountain!
    Reply With Quote
      #5  
    Unread 07-02-2006, 04:25 PM
    Silver Member
     
    Join Date: Jan 2003
    Location: Wallaroo, South Australia
    Posts: 201
    Re: temperature to velocity variation input

    Scott, I have numerous examples of temperature variation that I could use, but here is one example and I will look up records for others.
    Example 1
    25/06 AI Rem Case, Fed 215 Primer, Nosler 100 grn SPBT LL 3.180 Load 60.5 grains IMR 4831

    01/06/1988 - Temp 11C (52F) - 3,554 FPS (3 shot group)
    01/07/1988 - Temp 15C (59F) - 3,589 FPS (3 shot group)
    20/03/1989 - Temp 28C (83F) - 3,673 FPS (15 shots 3 groups)
    19/05/1990 - Temp 14C (57F) - 3,547 FPS (3 shot group)

    My experience is that all powders that I have tested seem to increase in velocity as temperature increases. Although some may rise more than others. Regards, Brian
    Reply With Quote
      #6  
    Unread 07-02-2006, 08:34 PM
    Platinum Member
     
    Join Date: Feb 2004
    Location: Pennsyltucky
    Posts: 2,630
    Re: temperature to velocity variation input

    Brian,not on subject but why are you using a 215 primer with that case? i'll bet you'd get a better ES and downrange accuracy with a milder primer.
    __________________
    davesonlinedeals.com
    Reply With Quote
      #7  
    Unread 07-03-2006, 01:55 PM
    Silver Member
     
    Join Date: Jan 2003
    Location: Wallaroo, South Australia
    Posts: 201
    Re: temperature to velocity variation input

    Dave, That test was done 18 years ago, when my gunsmith recommended me to use magnum primers. I still use magnum primers whenever I am using ball powders, and especially when I am using H870. However, I have been using the Rem 91/2M primer recently and that does seem to be milder than the Fed 215.

    I will take up your suggestion and do a test of a standard V magnum primers in my 25/06AI, and see what the results are. Regards, Brian.
    Reply With Quote
    Reply

    Bookmarks

    Thread Tools
    Display Modes


    Similar Threads for: temperature to velocity variation input
    Thread Thread Starter Forum Replies Last Post
    Air Temperature Effects On Muzzle Velocity By Gustavo F. Ruiz ADMIN Technical Articles - Discussion 34 11-15-2014 05:12 PM
    Hodgdon's "Extreme Powder" - reduce velocity variations due to temperature changes Len Backus Rifles, Bullets, Barrels & Ballistics 45 10-14-2010 12:11 AM
    Effects of Temperature on Velocity... BENNYBOOBOO Reloading 4 04-22-2009 02:30 PM
    temperature effect on velocity trb0 Rifles, Bullets, Barrels & Ballistics 2 08-27-2007 05:26 PM
    Muzzle velocity variation chessman Rifles, Bullets, Barrels & Ballistics 5 05-02-2004 08:34 PM


    All times are GMT -5. The time now is 06:52 PM.


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