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Old 22nd June 2010, 07:48 PM
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Conor Conor is offline
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Join Date: May 2009
Member of: Nelson & Nomads airgun club
Location: Ardboe, Co.Tyrone.
Posts: 2,657

It is the sidewheel parallax mechnism that is being affected. The POI is not effected.
Snipers have spotters, laser rangefinders, satelite co-ordinates, intelligence info for exact weather conditions etc.
For us the parralax mechanism determines the range, if this shifts in temperature we either under range and miss low or over range and miss high. E.G. a 55yrd target measured with tape in 30degrees, with scope you range it 59yrds dial accordingly and dink high, if you had used your 55 yrd setting you would have the correct elevation for the target.

In a really bad case both the gun and the scope are affected by temperature, then you are really in trouble Heat can cause guns to run faster and cold slower which would only exaggerate your difficulties in varying temperatures with a scope thats parralax mechanism varies with temp change.

This is of course IMO and there will be other more knowledgeable people along to help.
He who never made a mistake never learned!
He who never missed never shot!
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