powder burn temps?

[jlvandersnick]

Despite searches using a lot of different words, I can not find a chart that shows powder burn temperatures. Not burn rate, burn temperature.

Could someone point me in the right direction.

Thank in advance
Jerry

 

[Murray Brook]

If you are referring to heat of explosion of the powder you can find that in QL or GRT. It is expressed in kj/kg.

 

[46and2]

Despite searches using a lot of different words, I can not find a chart that shows powder burn temperatures. Not burn rate, burn temperature.

Could someone point me in the right direction.

Thank in advance
Jerry

Taken from Quickload, so take it for what it's worth.
You're probably going to get some comments soon about how it is affected by cartridge, pressure and temperature. So get ready.

 

[topclass2017]

Not trying to open a heated debate (pun intended), but my curiosity has been piqued...if one should not look at 2 powders that are next to each other on the burn rate chart as being comparable or substitutable, does burn temp provide a more accurate assessment of a similarity between powders? For examples, the 2 4895's reflect a 20* burn temperature variance. Varget and VV N550 show the same temp.

 

[jlvandersnick]

Thanks 46and2

WOW....... some of those are real eye openers

 

[DocBII]

46and2,

Can you add/publish this/list in a more available format?

Thanks.
DocBII

 

[46and2]

46and2,

Can you add/publish this/list in a more available format?

Thanks.
DocBII

I wish I could.
I believe that is a screenshot of a post from quickload on this forum from years ago.
I've gathered numbers for newer powders by asking members here along the way.

 

[DocBII]

46and2,

You've done good Perhaps the moderators will make this a sticky or add it to the bulletin.
I could see it having a qualified moderator updater, along with the reluctance of manufacturers fearful of liability or data age.

No ideal as to the liabilities of customer sourced data.

Thanks,
DocBII

 

[Straightshooter1]

46and2,

Can you add/publish this/list in a more available format?

Thanks.
DocBII

I don't have that full list in a different format, but I do have this abbreviated list that can be added to it that I have for my use:

 

[jelenko]

How do you use the burn rate to help in reloading?

 

[Straightshooter1]

How do you use the burn rate to help in reloading?

To be clear, those numbers in that chart, if that's what you're referring to, is not for "Burn Rate". Those numbers are for "Heat of Explosion", which is very different from the number for Burn Rate Coefficient. With that understood . . .

I use "burn rate" adjustments in QL to produce the velocity I'm getting from my chrono and looking at Barrel Time. I try to keep Barrel Time the same that has produced good results or close to the same with changing factors like different lot of powder or just a different powder, ambient temperature changes and maybe even a different bullet.

 

[Webster]

Despite searches using a lot of different words, I can not find a chart that shows powder burn temperatures. Not burn rate, burn temperature.

Could someone point me in the right direction.

Thank in advance
Jerry

I don't care what the temp is I just want small groups. I always got good barrel life with the powders I use,

 

[Doom]

To be clear, those numbers in that chart, if that's what you're referring to, is not for "Burn Rate". Those numbers are for "Heat of Explosion", which is very different from the number for Burn Rate Coefficient. With that understood . . .

I use "burn rate" adjustments in QL to produce the velocity I'm getting from my chrono and looking at Barrel Time. I try to keep Barrel Time the same that has produced good results or close to the same with changing factors like different lot of powder or just a different powder, ambient temperature changes and maybe even a different bullet.

As noted the data is heat of explosion which it the energy released in the explosion. The maximum temperature that is produced by this energy varies for a given powder based on cartridge and burn rate of the powder.

If two powders have the same heat of explosion (and similar composition, single base or double base) and same charge the slower burn rate powder should produce a lower maximum temperature since it will typically produce its energy at a lower pressure and in a larger. volume.

 

[wboggs]

As noted the data is heat of explosion which it the energy released in the explosion. The maximum temperature that is produced by this energy varies for a given powder based on cartridge and burn rate of the powder.

If two powders have the same heat of explosion (and similar composition, single base or double base) and same charge the slower burn rate powder should produce a lower maximum temperature since it will typically produce its energy at a lower pressure and in a larger. volume.

Very informative. Do we assume the higher temps increase throat errosion?

 

[46and2]

Very informative. Do we assume the higher temps increase throat errosion?

What if throat erosion and fire cracking were results of different processes?

 

[Webster]

What if throat erosion and fire cracking were results of different processes?

It's called hot gas erosion.

 

[jelenko]

What if throat erosion and fire cracking were results of different processes?

Such as?

 

[46and2]

Such as?

It is a question.

 

[Webster]

Such as?

https://apps.dtic.mil/sti/tr/pdf/ADA328657.pdf

To complicated to worry about. After one experiment they stated they couldn't relate temperature to the amount of erosion. You may have to paste the URL into Google. AccurateShooter doesn't like PDF files.

 

[T Kop]

I want to test if a graphite or a zinc lubricant after cleaning would help with the throat. Fast 6mms are murder