After cooking my Steyr in my van at Newbury, I have been researching temp shift on gun and scope and have fitted a temp strip to the scope and a digital thermometer under my cheek piece to measure air temp.
The scope (old big nikko) begins to over range by upto 7 yards! from 28 degrees and upwards. So I double checked this by cooking the gun in the heat (34 degrees) and checking the range finding as it cooled.
I found the scope continued to over range right down to 22 degrees, which I guess means that the scope internals were still hot and continued to cause the problem.
If scopes were designed to range find (which they are not) this problem could be engineered out, but until someone builds a real FT scope we will have to chase the temp along with the wind!
Anschutz 2013 MEC1 .22LR
Miroku 3800 12bore
Last edited by Gibbs; 17th June 2010 at 07:52 AM.