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Old 12th April 2013, 05:46 PM
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Tench Tench is offline
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Join Date: Sep 2009
Location: derby
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My aproach to maintaining consistent velocity and not suffering a drop on colder days is to never get the gun warm, my safe is not in the house and the gun NEVER goes in the house. If you set the power with the gun warm and then expect it to maintain that level in sube zero conditions with a lot of guns you are going to be dissapointed, not to mention the expansion and contraction of the scope tube breech and mounts causing possible zero shift. It may need minor seasonal adjustment but most do. I also find best consistency comes when a gun has settled for a long period without adjustment, constantly adjusting and expecting brilliant fps consistency is asking a lot. I have seen the biggest cold temp drops occur with alloy chassis guns that are kept in a warm place. At some of the winter shoots a lot of Steyrs suffered missed shots low on long targets. Set it up cold, always keep it cold and it will perform in the cold.
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Old 12th April 2013, 06:27 PM
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Ceathreamhnan Ceathreamhnan is offline
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I agree absolutely with Simon - I zero the gun in the cold, keep it cold for a good 12 hours before the shoot, and don't fiddle with scope on zero range. Even if the gun is lower on power in an absolute sense in the cold compared to indoors, if it's zeroed at the lower temp it should still be consistent.
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Old 12th April 2013, 06:58 PM
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I set mine at home around 785fps knowing that it will drop to 770fps minimum in the extreme cold, my zero doesn't shift summer to winter as long as the power is right.
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