Faster as she goes

Discussion in 'Reloading' started by rwintuc, Jun 18, 2009.

  1. rwintuc

    rwintuc Member

    Messages:
    8
    Joined:
    Mar 25, 2009
    Hi guys. I am new hear and appreciate the information you share so freely.

    I had a question I thought you might be able to answer.

    Should a load get faster as the gun gets hotter?

    I was testing some new load for .223 Rem and noticed all my loads get faster as I get through the magazine.

    For Example:

    Nosler BalTip Spitzer 55g
    Rem 7 1/2 BR
    LC Brass
    18" Barrel 1/9 Twist

    IMR 4064 25.8g
    Shot - Velocity
    1- missed by chrono
    2- 2854
    3- 2830
    4- 2930
    5- 2902
    6- 2863
    7- 2897
    8- 2925
    9- 2925
    10- 2861

    A trend line on these shots graphed out shows a 23fps increase over the course of ten shots.

    Is this Normal?
     

  2. AJ Peacock

    AJ Peacock Well-Known Member

    Messages:
    2,229
    Joined:
    Oct 7, 2005
    In general yes, a lot depends on how long the cartridge sits and bakes in the hot chamber. Also, the type of powder will determine how large the difference will be.

    AJ
     

  3. Mikecr

    Mikecr Well-Known Member

    Messages:
    4,246
    Joined:
    Aug 10, 2003
    Every gun I have does it.
     
  4. rwintuc

    rwintuc Member

    Messages:
    8
    Joined:
    Mar 25, 2009
    I was alway one who from youth tried to hold for wind and Elevation not understanding what i was doing.

    Today i have learned a lot about making true adjustments and holding center and having faith all the work i did to get there will pay off. And it has paid off.

    Question - at what change in valocity will i have to start changing my adjustments? or have I already seen the extreams in my testing? ex: Prarie dogs @ 500yd's