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Normal Topic ammo thats been hot - safe when cooled down? (Read 1290 times)
Penguinbait
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ammo thats been hot - safe when cooled down?
Mar 23rd, 2021 at 1:46pm
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Hello forum - hoping someone has an educated answer on this.  I've got some centrefire ammo stored in a place where it probably gets up to 50 or 60C on hot days.  Is there a risk that temperature would change the pressure characteristics to a dangerous level?  Or is it designed to cope with say up to XX degrees C?  If not unsafe, would there be any accuracy impact?
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Re: ammo thats been hot - safe when cooled down?
Reply #1 - Mar 23rd, 2021 at 2:25pm
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No. Not a good temp for the powder to be raised to. Will exacerbate its natural decomposition rate significantly, and MAY increase pressures.

Remember that most all modern rifle powders are based on absorbing nitroglycerine and/or nitrocellulose into a reasonably inert medium. Heating them up too high can hasten their reverting back to their initial parts Shocked
  
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Re: ammo thats been hot - safe when cooled down?
Reply #2 - Mar 23rd, 2021 at 2:39pm
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Thanks XR.  I'm guessing there is no way of telling whether there is an issue?.  But - will move it to a cooler place asap.
  
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Re: ammo thats been hot - safe when cooled down?
Reply #3 - Mar 30th, 2021 at 7:33am
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It depends on the powder, some powders are temperature sensitive, and others are not. AR2209 is not for example.
Although people don't seem to worry at all about the powder that is already loaded in cartridges being kept in hot places, you should move your stored powder if it is going to be cooked at that temperature. Unless it displays different characteristics when you shoot it, or has started to smell strongly it will be alright.
  
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Re: ammo thats been hot - safe when cooled down?
Reply #4 - Apr 7th, 2021 at 1:54pm
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Thanks guys, appreciate the advice.  Missed a good fallow buck last week, and I need an excuse.  I am a little concerned that when I check zero it will be fine tho....
  
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