Temperature Sensitivity of Powders

[HotIce]

There are very fine charts listing the relative burn rates, but I can't find anything about temperature sensitivity.
Do powder manufacturers publish such data?
Has anyone ever done experiments on the matter, by posting some sort of powder sensitivity chart?

 

[Victor N TN]

Re: Temperature Sensitivity of Powders

I would be interested in seeing that list as well.

 

[glock24]

Re: Temperature Sensitivity of Powders

The only data I've seen was published by Hodgdon as an advertisement for their Extreme powder series;

http://www.hodgdon.com/smokeless/extreme/page2.php#top

 

[sawgunner2001]

Re: Temperature Sensitivity of Powders

Nothing official as far as I know. Just rules of thumb. Ball powders more temp sensitive than extruded is the biggest one (that I know of). Hodgdon has done amazing things with their "extreme extruded" line. I've only been reloading for a little over a year, so take my knowledge with a grain of salt.

 

[HotIce]

Re: Temperature Sensitivity of Powders

Wow! IMR4895 has an eight-fold spread WRT H4895?!?

 

[Victor N TN]

Re: Temperature Sensitivity of Powders

While I like and have several Hodgdon powders, I call the one on the numbers from batch to batch. I have weighed charges while working on loads in the same rifle, same chronograph and have 20 to 30 fps difference.

While I'm not going to stop using their powders. I would like to see some testing done by an independent testing laboratory.

 

[HotIce]

Re: Temperature Sensitivity of Powders

Agreed. Independent is the key when it comes to this kind of tests.
It'd be sufficient that powder manufacturers would give two burn rates, at two different (Lo/Hi) temperatures of a given spread.
They sure have these numbers.

 

[Victor N TN]

Re: Temperature Sensitivity of Powders

I'm sure, like most other manufacturers they have rooms full of file cabinets of data. Because of the trivial law suits choking our court systems they choose to not release it.

 

[Grump]

Re: Temperature Sensitivity of Powders

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Victor N TN</div><div class="ubbcode-body">I'm sure, like most other manufacturers they have rooms full of file cabinets of data. Because of the trivial law suits choking our court systems they choose to not release it. </div></div>
Nope.

They are protecting trade secrets.

Any routine lawsuit relating to the safety of the product would result either in the data getting released under a confidentiality agreement, or quick settlement to avoid releasing the information. Subpoenas work wonders. Even banks lose most of their fights seeking to keep discoverable information under wraps, at least as far as getting it to opposing counsel or in front of a judge (to decide whether it's really a protectable trade secret).

Ask Charlie Petty about the firearms industry and "proprietary" information. A competitive edge is worth far more dollars than a measly lawsuit.