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Powder Burn Rate Chart... NEW

 
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  #1  
Old 06-09-2011, 12:42 AM
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Powder Burn Rate Chart... NEW

Updated with the latest powders out...

Just an FYI to have and to use....

CLICK LINK BELOW....
Burn Rate
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Last edited by Sendero_Man; 06-09-2011 at 12:42 AM. Reason: burn rate link
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  #2  
Old 06-09-2011, 01:20 AM
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Re: Powder Burn Rate Chart... NEW

Looks to be pretty much up to date as it has Superformance and Leverevolution listed but not Alliant's new RL-50 which has been out for over a year now.
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  #3  
Old 06-09-2011, 09:33 AM
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Re: Powder Burn Rate Chart... NEW

The problem with a chart like that is that burn rate is not a single parameter which defines the characteristcs of a firearms propellant..

In the computer program "Quickload" there are eight coefficients used to define each powder.
The coefficients of each powder are determined by laboratory burn tests on samples of each powder.

The parameters are:
bulk density
solid density
heat of explosion
ratio of specific heats
Ba,factor b, limit z1, and pro/degressivity coefficient.

The last four describe the "burn rate" which certainly isn't defineable just by it's posiiton on a one dimensional chart, yet less by it's posiiton on a list.
Even getting the eight parameters above optimally correct deoesn't completely define a powder's characteristics, but it does give a decent prediction of the pressure curve and energy transferred to a bullet in the conditions of typical firearms chambers and barrels.

Because burn rates are non-linear the speed at whch powders burn change with the conditions under which they are burned. Burn rate charts give no indication of what those conditions are. You frequently see charts which change the order of various powders. That's doesn't mean the powders have changed or that one chart is in errror, rather that the condiitions of the tests aren't the same.

Hogdon's (and similar) burn rate chart may be of some use, but in no way does it mean that two powders which are adjacent on the chart are interchangable with only a small change of charge weight.. To think so is asking for disaster.

Would you sort a room full of people by their height and think you had a good representation of their capabilities? It would have some correlation. The babies would be a one end and adults at the other, and their strength would have some correlation to the chart. maybe as much as with the powder burn rate charts.

Last edited by LouBoyd; 06-09-2011 at 10:31 AM.
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  #4  
Old 06-09-2011, 09:47 AM
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Re: Powder Burn Rate Chart... NEW

Excellent commentary and good analogies by Lou. Heed the man's advice.
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  #5  
Old 06-09-2011, 10:33 AM
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Re: Powder Burn Rate Chart... NEW

Posted it just an FYI for anyone looking for new/updated chart with some of the latest powders that have come out...

nothing more, nothing less.
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  #6  
Old 06-09-2011, 12:06 PM
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Re: Powder Burn Rate Chart... NEW

Thanks for the link I have been looking for a new list.
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  #7  
Old 06-09-2011, 12:19 PM
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Re: Powder Burn Rate Chart... NEW

We do not use list for powder charges, we use list to find a powder a little slower or faster than what we are using. Then go to manual and find min and max charge weights, start low and work up. I have Quickload myself and it is not all that accurate either. You can not punch numbers in quickload and expect them to be accurate either.



Quote:
Originally Posted by LouBoyd View Post
The problem with a chart like that is that burn rate is not a single parameter which defines the characteristcs of a firearms propellant..

In the computer program "Quickload" there are eight coefficients used to define each powder.
The coefficients of each powder are determined by laboratory burn tests on samples of each powder.

The parameters are:
bulk density
solid density
heat of explosion
ratio of specific heats
Ba,factor b, limit z1, and pro/degressivity coefficient.

The last four describe the "burn rate" which certainly isn't defineable just by it's posiiton on a one dimensional chart, yet less by it's posiiton on a list.
Even getting the eight parameters above optimally correct deoesn't completely define a powder's characteristics, but it does give a decent prediction of the pressure curve and energy transferred to a bullet in the conditions of typical firearms chambers and barrels.

Because burn rates are non-linear the speed at whch powders burn change with the conditions under which they are burned. Burn rate charts give no indication of what those conditions are. You frequently see charts which change the order of various powders. That's doesn't mean the powders have changed or that one chart is in errror, rather that the condiitions of the tests aren't the same.

Hogdon's (and similar) burn rate chart may be of some use, but in no way does it mean that two powders which are adjacent on the chart are interchangable with only a small change of charge weight.. To think so is asking for disaster.

Would you sort a room full of people by their height and think you had a good representation of their capabilities? It would have some correlation. The babies would be a one end and adults at the other, and their strength would have some correlation to the chart. maybe as much as with the powder burn rate charts.
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