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Temp vs Velocity- insights and solutions

 
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Old 09-18-2010, 01:43 PM
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Join Date: Dec 2009
Posts: 58
Temp vs Velocity- insights and solutions

I'm burning US 869 because it is supposed to be temperature insensitive and I just got a serious wake up call! I went from 9.25MOA of come up for 556 yard shot at 75F to 11MOA at the same distance at 32F. (shooting 300 SMKS w/99grains US869 in a RUM)

Do you guys try to keep your shells warm when your out glassing for game in cold weather or do you figure out your come ups based on temperature of the shells? I run Exbal and was wondering if there was anything about this program concerning temperature I should know about?

I live in Alberta so temps get pretty extreme here!
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Old 09-19-2010, 01:46 PM
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Join Date: Jun 2009
Location: Bedford PA
Posts: 286
Re: Temp vs Velocity- insights and solutions

The temp makes a huge difference! If you want to be precise with your shot placement you'll have to adjust to the given temperature. That's why a hand held unit is nice. If you don't have one the next best thing is, have a couple different click charts based on the variance in temperature.

I used to "bake" loads when I competed in long distance, not only is this unsafe but unreliable. I lost a shoot one time in Heavy gun 1000 yard comp because the sun peeked behind the clouds on my 10 shot and it dropped about 8-10 inches low.
The weather is the biggest factor when shooting long distance so my best recommendation is carry different charts based on 10 degree increments

Hope this helps
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Old 09-19-2010, 03:03 PM
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Join Date: Sep 2010
Location: New Zealand
Posts: 308
Re: Temp vs Velocity- insights and solutions

I tried US869 in a big 338 and gave up on it in the end, yes it shot great at long range but the vetocity range was way to big in different temperatures on different months of the year giving different impact points on the target at 1000 yards++. There are to many other things to worry about at long range,
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