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Powder Stability At Low Temp

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Powder Stability At Low Temp

Postby Shepard » Fri Jan 31, 2014 5:17 pm

In all the conversations I've read here about temperature sensitivity -- everybody talks about how cold decreases velocity. From what I got out of my reading is that a hand loader should be more worried about hot days. Worrying about the few feet less velocity and trying to load to compensate for it can lead to possibly over pressurizing your chamber. Here is a short article to get the juices flowing. I don't know who the writer is -- but I feel I've experienced this shooting on hot days with heavy or close to max loads.




http://stevespages.com/tempvsvelocity.html
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Re: Powder Stability At Low Temp

Postby ShootnMathews » Sat Feb 01, 2014 4:35 am

I totally agree. If you're using a temp sensitive powder and are doing load work up in cold to mild temps and end up with a load close to max. You might end up with a pipe bomb on a hot summer day. That's why I stick with hodgdon "extreme" powders or other temp stable stuff. I shoot all year around and don't like trying to compensate for it. If I load work and figure drops in the fall for hunting I still want to be able to hit my target in the middle of summer to. Or on that frigid winter morning.
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Re: Powder Stability At Low Temp

Postby farmerboy78 » Sat Feb 01, 2014 7:12 am

What load do you use jared?
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Re: Powder Stability At Low Temp

Postby ShootnMathews » Sat Feb 01, 2014 9:34 pm

In my mosin, right now my accuracy load is 42.5 grns of Varget. But since I haven't seen it for a long time I'm trying new stuff. I started some load working with H4350 which is an extreme powder ( temp stable). I also just picked up a can of imr4350 tonight because everyone talks so high of it. But I'll have to do some research on temp stability.

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Re: Powder Stability At Low Temp

Postby Shepard » Sat Feb 01, 2014 10:53 pm

I would have to say the article I originally posted is of an IMR product If he's talking to DuPont engineers about it. I use IMR 4350 90% of the time or IMR 4320 the other 10% -- there very old style powders so they may have temp issues. There both double base powders and they are much more stable then single based powders. I don't have the worries that you who hunt seem to have. If I could hunt knowing what I understand now -- may sound dumb but I'd just keep my bullets in my pocket till I needed them and keep them warm.
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Re: Powder Stability At Low Temp

Postby ShootnMathews » Sun Feb 02, 2014 5:35 am

Doing some research here. Digging up some test results from the Internet on sensitivity. Here's what one test list. BTW they have nearly all the popular powder on there. I'm only going to post the ones I hear guys here talk about.

H4350 - .29 FPS per degree
IMR 4350 - .64 FPS per degree
IMR 4320 - 1.32 FPS per degree
Varget - .19 FPS per degree
H4895 - .23 FPS per degree
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Re: Powder Stability At Low Temp

Postby 0933 » Sun Feb 02, 2014 9:09 am

ShootnMathews wrote:Doing some research here. Digging up some test results from the Internet on sensitivity. Here's what one test list. BTW they have nearly all the popular powder on there. I'm only going to post the ones I hear guys here talk about.

H4350 - .29 FPS per degree
IMR 4350 - .64 FPS per degree
IMR 4320 - 1.32 FPS per degree
Varget - .19 FPS per degree
H4895 - .23 FPS per degree


Good info,thanks for posting Jared! :thumbup:

Do you have a link to the original article/table?
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Re: Powder Stability At Low Temp

Postby Shepard » Sun Feb 02, 2014 11:16 am

I figured IMR products would have the highest deviations in the numbers. This powder company has been in business longer then most. I guess if it were a big problem they would have fixed it. Other companies picked up the slack.
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Re: Powder Stability At Low Temp

Postby ShootnMathews » Mon Feb 03, 2014 12:50 pm

0933 wrote:
ShootnMathews wrote:Doing some research here. Digging up some test results from the Internet on sensitivity. Here's what one test list. BTW they have nearly all the popular powder on there. I'm only going to post the ones I hear guys here talk about.

H4350 - .29 FPS per degree
IMR 4350 - .64 FPS per degree
IMR 4320 - 1.32 FPS per degree
Varget - .19 FPS per degree
H4895 - .23 FPS per degree


Good info,thanks for posting Jared! :thumbup:

Do you have a link to the original article/table?

I'll post a link to it tonight. It was a thread on LRH forum and one guy compiled it from several sources. I might just call the manufacturer and see if they can give me any better info on this.

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