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Barrel length for slow buring powder

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  #1  
Unread 04-26-2013, 09:49 PM
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Barrel length for slow buring powder

Another question........................When shooting slow burning powder in the .243 AI is a 24inch barrel long enough for powders like RL 22 or even RL 25 or H1000

Guy are asking me questions that I dont have answeres for..........the reason I ask so many on this sight, I have a lot to learn.

Greg
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  •   #2  
    Unread 04-26-2013, 10:04 PM
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    Re: Barrel length for slow buring powder

    Is the barrel long enough for what?

    Same or higher velocity from more slower powder?
    Accuracy that doesn't degrade from excess muzzle pressures?

    It starts with a bullet, it's weight and twist requirements, and case capacity needed combined with given powders to drive the bullet to needed MVs.
    While shorter barrels are stiffer -all else equal, internal ballistics is still a dominant contributor to result.
    While I couldn't prove it, I'm sure there are better barrel lengths than others for each internal ballistic combination and application.
    But it would be a massive undertaking to produce a formula that passes all tests. We won't see it in our lifetimes.

    In otherwords,, try it & see
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      #3  
    Unread 04-27-2013, 04:09 PM
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    Re: Barrel length for slow buring powder

    Long enough for that slow of powder?
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      #4  
    Unread 04-27-2013, 04:40 PM
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    Re: Barrel length for slow buring powder

    Greg,

    When you pull the trigger the bullet will go out of the barrel so a 24” barrel is “long enough”. All the powder may not burn but usually when you use a powder that is “too slow” there is a tendancy for the ES to tighten up. I’ve used IMR7828SSC in a 22-250 with good results and that powder is WAY too slow for that chambering.
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    Unread 04-27-2013, 05:23 PM
    Edd Edd is online now
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    Re: Barrel length for slow buring powder

    Quote:
    Originally Posted by Greg Duerr View Post
    Long enough for that slow of powder?
    The length of your barrel doesn't change your powder choice.
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      #6  
    Unread 04-29-2013, 06:26 AM
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    Re: Barrel length for slow buring powder

    Quote:
    Originally Posted by Edd View Post
    The length of your barrel doesn't change your powder choice.
    It does if you want your load's pressure curve to be the same size and shape for every shot fired. That's a big help for best accuracy and lowest muzzle velocity spreads.
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      #7  
    Unread 04-29-2013, 11:11 AM
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    Re: Barrel length for slow buring powder

    Quote:
    Originally Posted by Greg Duerr View Post
    Another question........................When shooting slow burning powder in the .243 AI is a 24inch barrel long enough for powders like RL 22 or even RL 25 or H1000

    Guy are asking me questions that I dont have answeres for..........the reason I ask so many on this sight, I have a lot to learn.

    Greg
    For shorter barrels I would use faster powders, i.e., H1000 over Retumbo. That doesn't mean the slower powder won't work, but the faster powder will be more efficient and probably more consistent.
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