<p>I've been setting up a 79 for myself, I posted about the power adjuster down the page, and ran a temp/vel graph.</p><p><img alt="QB79_fps_temp_jpg_2010.jpg" src="http://www.network54.com/Realm/tmp/1287389425.JPG">
The odd thing is that it max'ed at 22, I know that 22/72 Deg is recommended as the temp to test at but I wasn't expecting the max vel to be there.
Any idea why? There isn't much left that is standard, 3.5oz bottle, light hammer, new ptfe valve stem/seal, longer soft valve spring, transfer port, long probe and short barrel.
So I'm thinking if the ambient temo is bellow 15 deg C the power drop is too extreme for anything but plinking.
My Website -http://www.ora8i.rivington-riflemen.org
Your velocity increase follows the pressure increase until you reach your peak velocity at 22C, it then looks like the increase in pressure isn't letting the valve to open fully after that temp......have to put a stronger spring behind the striker maybe but then your even velocity will suffer....