Hanco you might take a look at R23 it works in most applications that R22 and 4350 work. It's temperature tolerance is as good or better than H4350 and lot to lot variation (so far) beats the heck out of R22. I am getting almost as much velocity with R23 as I am getting with R26 so I may phase out R26 although there are rumors that Nitro Chemie is working to make it even more temperature insensitive which it is very good at for normal temperatures already, it's just the abnormal temps of Texas where there is much variation and pressure increases.

"When you disarm the people, you commence to offend them and show that you distrust them either through cowardice or lack of confidence, and both of these opinions generate hatred." Niccolo Machiavelli