Nice evidence of temperature affects
How rise temperature poi is little changed… See on yellow.
http://www.network54.com/Forum/79537/thread/1233716181/TEMPERATURE+AFFECTS+on+VELOCITY
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Mine change too from 60 degrees to 80-90 it changes 3 mils.
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Respectfully, I don’t think a free-floated barrel is going to remedy the problem at all. I think it would only make it worse in some cases. Theoretically, if you take the barrel of, say, a Theoben Rapid, if it were to expand or heat up, guess what, the scope isn’t going to follow it. You see, the juncture –where the barrel and action meet — won’t allow for movement of both. If that barrel were to bend due to heat, for example, the scope will remain in its original position, and vice versa for the scope. Now, if that action is in the middle of the barrel like in bullpups then things get better.
The rail-to-barrel-to-airtube clamp like the Cricket’s is, personally, the best design to date because it serves to sort of “weld” the components together so that “IF” either one component were to move the others will follow. I have never had any shifting whatsoever with my Cricket. I live in the valley in Arizona, and right now we are in the triple digits. My home’s temperature maintains a 75-degree temperature. Even when bringing out my gun to shoot in my backyard and abruptly expose it to 115-degree heat, I’ve never had any POI shift at all. I actually explained in detail my thoughts on the Cricket’s design a while back on the Kalibrgun forum: http://forum.kalibrgun.eu/index.php?topic=349.0
This is why a floating barrel was invented.
I did a test. My cricket is normally stored in our cellar where is 23°C /74°F and then I try to shoot on evening direct sun where temperature were 35°C / 96°F
When I start shooting from the cellar POI was on place after 15min when whole cricket and optic warm up I got POI 1cm to left and up. There was no wind. Then I put the cricket to the cellar to cold down for a 1 hour and then I test it again POI was on place like before. So, cricket do not like shooting exposed to direct sun.
Ain’t Mother Nature a bitch !! :angrymob:
If she can’t play with your wind, she’ll find another way to spoil all your fun. :rofl:
No matter how mad she can make me, I still love her though.
Just like my mother in law. 
~ GKU
This could be attributed to many things. Like barrel warming which usualy does not matter in an airrifle normally! But if you pull your gun from a cold car into a very hot environment your poi might change as the barrel warms up. :2cents:
On a regulated gun how can poi be possible it’s just not feasible tbh 120 bar regulated shot is 120 bar regulated no matter what the temp seen the effect on co2 but never a regulated pcp
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Respectfully, I don’t think a free-floated barrel is going to remedy the problem at all. I think it would only make it worse in some cases. Theoretically, if you take the barrel of, say, a Theoben Rapid, if it were to expand or heat up, guess what, the scope isn’t going to follow it. You see, the juncture –where the barrel and action meet — won’t allow for movement of both. If that barrel were to bend due to heat, for example, the scope will remain in its original position, and vice versa for the scope. Now, if that action is in the middle of the barrel like in bullpups then things get better.
Perhaps does not relate to airguns that much but the barrel only expand lengthwise due to heat, free floating barrel is not only working but giving exceptional performance on My Krieghoff Combination weapon as the shotgun barrels interfere with the rifle barrel when it heats up otherwise..