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Barrel length for slow buring powder

 
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  #1  
Old 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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Old 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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Old 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  
Old 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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Old 04-27-2013, 05:23 PM
Edd Edd is offline
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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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Old 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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Old 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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