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Reloading Berger Bullets

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Faster as she goes

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  #1  
Unread 06-18-2009, 02:35 PM
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Join Date: Mar 2009
Posts: 8
Faster as she goes

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?
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  •   #2  
    Unread 06-18-2009, 02:49 PM
    Platinum Member
     
    Join Date: Oct 2005
    Location: Michigan
    Posts: 2,232
    Re: Faster as she goes

    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
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      #3  
    Unread 06-18-2009, 03:52 PM
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    Join Date: Aug 2003
    Location: NC, oceanfront
    Posts: 4,059
    Re: Faster as she goes

    Every gun I have does it.
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      #4  
    Unread 06-18-2009, 04:39 PM
    Junior Member
     
    Join Date: Mar 2009
    Posts: 8
    Re: Faster as she goes

    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
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