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ambient air temp when reloading question

Hi
I reload in my garage, and in summer it can get pretty warm, down here...I have loaded at around 100 degrees on your scale....does this really influence my load, even if I shoot it 3 weeks later at say 75 degrees F? If so would you be so kind to explain why?
 
Ambient temperature shouldn't affect the loading process, powder weight isn't temperature dependent. But it will influence pressures on the range resulting in varying MV spreads. Shooting the same load on a cold day will produce different results than shooting that load on a very hot day.
A drafty room will influence weight readings on the scale however. Eliminate all drafts in the reloading room.
 
Lapua40x said it! Note what your velocity is when you SHOOT the loads in hot weather. When it cools, your almost assured to see a velocity drop - and if it is enough - it may take you out of the accuracy node you found when you were working up your loads in the hot weather.
 
Make sure you store your powder where it isnt so hot as over time it will degrade it. Ask me how I know.
 
thanks for your thoughts, and i'll try move my powder to a cooler spot, good call.....if I could extend my rather poor initial question, I was thinking, that if the air I trap inside the case when I seat the bullet is thinner (because it is warmer) than say if I was loading at 45 ambient air temp will this influence the ignition
 
BJ343 said:
I was thinking, that if the air I trap inside the case when I seat the bullet is thinner (because it is warmer) than say if I was loading at 45 ambient air temp will this influence the ignition

BJ, ya gotta lighten up on yourself. Although I doubt it, factoring in the air density inside the loaded case as an influence on the ignition process may be critical to putting men on the moon but for sport shooting it's going waaaaay too far. :o
 
I live in MN and want to load delope in the winter also. Does it make sense when I get a load that is looking great at normal winter temps. Then try to keep the rounds warm/ hot to test and ensure it is not going to move out of an accuracy node, or increase pressure too much? Maybe a cooler with a large amount of steel in it heated to 95 degrees might keep the ammo warm until shot. It would be about 3-4 hours from leaving the house to shooting the last round.
Anyone experience with this?
 
BJ343 said:
thanks for your thoughts, and i'll try move my powder to a cooler spot, good call.....if I could extend my rather poor initial question, I was thinking, that if the air I trap inside the case when I seat the bullet is thinner (because it is warmer) than say if I was loading at 45 ambient air temp will this influence the ignition
BJ if your question relates to oxygen for combustion then you need not worry as smokeless powder does not require an exterior oxygen source for consistent combustion. The chemical reaction is enough, follow this link for more info. http://www.alliantpowder.com/getting_started/safety/storage_handling.aspx

Ian
 

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