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  #1  
Old 03-25-2011, 09:05 PM
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temp

If I zero my rifle with 80degree temp. the shoot it when its 40 out will I b low or high ?
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Old 03-25-2011, 09:26 PM
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Re: temp

Quote:
Originally Posted by zookman View Post
If I zero my rifle with 80degree temp. the shoot it when its 40 out will I b low or high ?
Probably low.

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  #3  
Old 03-25-2011, 09:38 PM
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Re: temp

I would have thought high ! Thinner air ! Me n my daughter drag raced for yrs . The corrected altitude would be lower in cooler temps!
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Old 03-25-2011, 09:57 PM
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Re: temp

Low....not much but lower.
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Old 03-25-2011, 11:40 PM
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Re: temp

Quote:
Quote:
Originally Posted by zookman View Post
I would have thought high ! Thinner air ! Me n my daughter drag raced for yrs . The corrected altitude would be lower in cooler temps!
Your powder will not burn as hot resulting in lower muzzle velocity.
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Old 03-26-2011, 09:38 AM
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Re: temp

Quote:
Originally Posted by zookman View Post
I would have thought high ! Thinner air ! Me n my daughter drag raced for yrs . The corrected altitude would be lower in cooler temps!
If you zero at 80 degrees and temp drops to 40, same altitude, bullet will be lower. As far as shooting at 40 degrees at higher altitude, I'd be interested to know if thinner air compensates for cooler temp.
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  #7  
Old 03-26-2011, 11:37 AM
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Re: temp

This also depends on other factors. Barometric pressure, humidity and also the distance you are shooting at. I use Density Altitude(which puts all those numbers together) when figuring out my drop charts and look at my Kestrel 4000 before shooting to determine my bullet drop.

Your zero should be almost identical if you are shooting less than 300yds. My zero is 100yds for all my rifles, others have 50 and some others do 200 or 300yds. I've been to Colorado at 8000ft to shoot and to Corpus Christi, TX where its 20ft above see level and my zero was almost the same, but distance was way off with the two different altitudes/pressure/humidity/etc...
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