Burn Rate & Powder Density

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Burn Rate & Powder Density

Post by dronning on 5/28/2018, 9:00 pm

There have been a few references to and questions about powder density lately so I thought I'd post a link to a list.
Powder burn rate & density

- Dave
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Re: Burn Rate & Powder Density

Post by mikemyers on 5/28/2018, 10:34 pm

Dave, is that available in an Excel spread sheet anywhere?

I found what I was looking for, comparing Bullseye to Clays, but I'm sure that's only a start in making a useful comparison.

Thanks for posting!
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Re: Burn Rate & Powder Density

Post by USSR on 5/29/2018, 6:37 am

While burn rate charts will vary from one to the other, this one is off more than most.

Don
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Re: Burn Rate & Powder Density

Post by Chris Miceli on 5/29/2018, 6:42 am

Lee has a good list of VMD, which is needed for the correct disk.






"The burn rate charts are educated guesses, speculative.  They are not arrived at by actual testing.  To be the result of actual testing, this means that each powder would have to be tested in exactly the same application.  This is impossible to do in cartridge/test barrel applications.  There is only one way that I know of to do this and that is by what is known as a closed bomb test.  I doubt very seriously if anyone is going to the expense and trouble to conduct such a test for all the powders on the market.  Anyone who comes up with a burn rate chart is likely consulting existing charts and then adding more powders or changing theirs a little bit just so it won't look exactly the same." - BEA .... a guy who knows a thing or two about smokeless powder.
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Re: Burn Rate & Powder Density

Post by USSR on 5/29/2018, 8:55 am

Educated guess, perhaps.   But whoever came up with that chart never went beyond high school. Smile

Don
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Re: Burn Rate & Powder Density

Post by james r chapman on 5/29/2018, 1:50 pm

USSR wrote:Educated guess, perhaps.   But whoever came up with that chart never went beyond high school. Smile

Don

How you figure? Generally pretty accurate.
Explain?
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Re: Burn Rate & Powder Density

Post by DavidR on 5/29/2018, 1:51 pm

This is in our sticky section that might be of interest.
http://www.bullseyeforum.net/t2279-powder-cross-over-equivalent-chart
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Re: Burn Rate & Powder Density

Post by dronning on 5/29/2018, 2:14 pm

All these burn rate charts are approximations.  Ever wonder why they only give a relative position verses and actual rate?  

There are at several burn rate charts by different Powder Mfg. and all are different.  Even  the cross reference charts vary.  Variation could be due to when or how the tests were done.  Another good question is just how much faster is the powder that is rated #1 verses #10.  Is the difference the same as #10 verses #20?

They are only guides and who is to say which one is right.

- Dave
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Re: Burn Rate & Powder Density

Post by fc60 on 5/29/2018, 2:34 pm

Greetings,

I refer to the "burn charts" to select powders of similar burn rates.

I do not use the chart as an exchange powder A for powder B.

Recently, I started testing 85 grain bullets in the 32ACP. The only load data is from Accurate and they list #2 and #5 powders with a maximum velocity of 700 FPS.

So, now I want to test Bullseye powder. I will load some sample rounds and check the velocity. Any that exceed 700 FPS will be rejected. My reasoning is that Accurate #2 and Bullseye are "similar" in burn rate.

I have done this with other calibers, as well. The end result was the use of TiteWad powder in the 32 S&W Long HBWC and 38 Special HBWC. Loading with a specific velocity in mind, I discovered loads that shoot extremely accurate, clean burning, and easy on the pistol.

There are no documented loads for TiteWad for pistols that I shoot.

In summary, use some common sense and a chronographs.

Cheers,

Dave
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Re: Burn Rate & Powder Density

Post by USSR on 5/29/2018, 5:20 pm

james r chapman wrote:
USSR wrote:Educated guess, perhaps.   But whoever came up with that chart never went beyond high school. Smile

Don

How you figure? Generally pretty accurate.
Explain?
Jim,

700X slower than W231/HP38?   Accurate #5 faster than Unique?   Laughable.

Don
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Re: Burn Rate & Powder Density

Post by james r chapman on 5/29/2018, 5:34 pm

USSR wrote:
james r chapman wrote:
USSR wrote:Educated guess, perhaps.   But whoever came up with that chart never went beyond high school. Smile

Don

How you figure? Generally pretty accurate.
Explain?
Jim,

700X slower than W231/HP38?   Accurate #5 faster than Unique?   Laughable.

Don
I was referring to the Lee chart which is load volume and generally accurate to tenths of a grain.
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Re: Burn Rate & Powder Density

Post by USSR on 5/29/2018, 5:44 pm

Lee chart?   The only thing I see is the chart by Tacticoolproducts in the OP.   And, I am only addressing the burn rate portion of it.

Don
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Re: Burn Rate & Powder Density

Post by james r chapman on 5/30/2018, 5:08 am

Chris Miceli wrote:Lee has a good list of VMD, which is needed for the correct disk.






"The burn rate charts are educated guesses, speculative.  They are not arrived at by actual testing.  To be the result of actual testing, this means that each powder would have to be tested in exactly the same application.  This is impossible to do in cartridge/test barrel applications.  There is only one way that I know of to do this and that is by what is known as a closed bomb test.  I doubt very seriously if anyone is going to the expense and trouble to conduct such a test for all the powders on the market.  Anyone who comes up with a burn rate chart is likely consulting existing charts and then adding more powders or changing theirs a little bit just so it won't look exactly the same." - BEA .... a guy who knows a thing or two about smokeless powder.

This. Powder density chart. Easy to miss if not read carefully.
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Re: Burn Rate & Powder Density

Post by USSR on 5/30/2018, 5:43 am

As I said, I am only referring to the burn rate chart posted in the OP. Could care less about powder density.

Don
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Re: Burn Rate & Powder Density

Post by james r chapman on 5/30/2018, 5:54 am

USSR wrote:Educated guess, perhaps.   But whoever came up with that chart never went beyond high school. Smile

Don

Glad you clarified that Don.
Because your comment was directly after the Lee chart comment.
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