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Cold Weather Reloading

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Old 12-16-2006, 09:59 AM
Junior Member
Join Date: Dec 2006
Location: Colorado
Posts: 18
Cold Weather Reloading


I'm new to LRH and need to ask a question about reloading for cold weather. I know that barrels and the like shrink somewhat in cold weather and as such, am seeing signs of pressure in loads that were fine in warm weather. I'm shooting a 204 Ruger for varmints in Colorado and Wyoming and noticed these signs in primer flow, even in factory loads from shots taken on cold mornings. Extraction is ok and the brass is new.

Does anyone out there have an idea as to just how much a load should be backed down for, say a 70 degree drop in temperature, percentage wise or whatever?
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Old 12-16-2006, 01:43 PM
Platinum Member
Join Date: Dec 2001
Location: Long Island, New York
Posts: 2,127
Re: Cold Weather Reloading

Interesting - It is more common for shooters to slightly increase their powder charge to accomodate for the loss in velocity due to sinificant drops in ambient temperatures.

I have never heard of chamber pressure rising with a fall in temperature. Learn something new every day. [img]/ubbthreads/images/graemlins/smile.gif[/img]
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Old 12-16-2006, 03:04 PM
Platinum Member
Join Date: Feb 2004
Location: Pennsyltucky
Posts: 2,625
Re: Cold Weather Reloading

i'll second what VH said and add i don't think your problem is powder quanity or ignition related.my bet is you have something physically wrong like the necks are being pinched.measure the neck dia. of your fired rounds and compare with loaded unfired.also check to see if the tip of the neck is not hitting against the end of your chamber.please keep us posted, i'd like to know what's causing this situation.
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Old 12-16-2006, 03:24 PM
Junior Member
Join Date: Dec 2006
Location: Colorado
Posts: 18
Re: Cold Weather Reloading

Thanks for the insight. I will check that.
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