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Old 3rd May 2010, 05:26 PM
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luger luger is offline
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Join Date: Nov 2009
Member of: Malta Allied Airgunners Club
Location: Malta
Posts: 272
Default Scope POI Shift Because of Heat

Going straight to the point here................can heat effect POI shift on a scope?

Scope is a Nikko Diamond MK3 and the gun is a HW97k so usual pcp cylinder overheating is excluded.

Only asking as I have recently experienced a POI shift 2 times (shooting low about 1"-1.5" between 25m-30m) and both times in scorching heat. Been shooting for about 4 hours under direct sunlight (and yes got sunburnt too ) last Saturday and today and after about 4 hours shooting I started hitting low. Chronod the gun and fps was constant 770's so no velocity problem there.

Things indicate scope POI shift because of the heat but I have never heard or read of anyone experiencing such a problem.

Is this possible or could the culprit be something else?
HW97 V-Glided with LP Eliminator Stock Big Nikko 10-50x60
TX200HC V-Mached with LP Eliminator Stock Tasco Custom Shop 8-40x56
CZ S200 FT Stock Big BSA 10-50x60
AA Shamal Big BSA 10-50x60
Steyr LG110HP HFT Modded EB Sniper

Last edited by luger; 3rd May 2010 at 05:28 PM.
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