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Daystate Airwolf owners

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Skip-in-WV

Skip-in-WV

Member
Apr 5, 2015
921
43
Morgantown, WV, United States
For now I have a Sightron 10-50 scope on my Airwolf. I've never shot it in FT competition. So, as the temperature warms up I've noticed large changes in the point of impact. From 70 to 80 degrees the difference was 6 clicks. It seems some rifle/scope combinations are unaffected or minutely effected by temp changes. How about yours? What have you done to minimise it?
 
Skip,

Some Sightron scopes are more susceptible to temp shifts than others.

6 clicks, speculated at a 30 zero, is not that much 

Simple test to determine if it's the gun or scope.

Next time, zero and sight in as normal at 70 degrees. Shield just the scope. Wrap it in thin rags, wrap it in tin foil and rags, leave the rest of the gun alone.

Wait till its 80 again.

If something shifts zero, it's most likely not the scope. Sightron scopes are usually for the most part, stable.

I see that is an Airwolf. Does it have a shroud? That has some bearing on temperature shifts as well.

Tom Holland 


 
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Hi Skip,

All the FT pcp rifle/cope combinations are affected to some extent. Part of setting a rig up is testing at the whole temperature range you will encounter in competition. 6 clicks can be a lot depending on which turret gradient is used. My 1050 is MRAD and shooting at 17 fpe with a 30 yd zero only requires 15 clicks for 55 yds. I chose MRAD so a click is a discernable movement of POI. The 1050 with MOA clicks are much finer and 6 may not be much. How much in inches or compared to the KZ might be a more applicable measure. I had a new Ataman that had copious grease inside the reg and it dropped 200 fps going from 60*F to 35*F. On the rifles I build my preference is a beefy stiff one-piece riser rail to bridge the receiver loading gap and Burris Zee rings with the plastic inserts. I have not worked on an Airwolf. I have 2 Steyr LG110s and they react differently to temperature change. Tom's advice above is good. A chrony may reveal some data on what is happening too. There is something to be said for the man who only has one gun as after a couple of seasons he knows exactly how his gun is going to react.

Will
 
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I doubt it has anything to do with the scope solely...but the way the scope is fastened in relation to the barrel could be part of the trouble.

Is the velocity changing in this 10 degree temp variation?

Are you talking about an elevation change or a windage change?

The last generation of Thomas rifles would vary about 2fps per 10 degrees of temp change. The newest vary zero over 60 degrees. They also exhibit no mechanical shift.

Mike
 
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Now, the weather is crappy. So, not much can be dome until Monday. I did get a few shots this morning before the rain started. I put a little space between the shroud and the receiver block and it looked like the POI was in the same position relative to the aim point as without the shroud. Since the shroud is so long it stands to reason that the "growth" of the shroud due to heat expansion may be a problem. We'll see what develops. Thanks for all the help and suggestions and help. I'll post what I find out.
 
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