c-22 bitters rootstock compatibility?

[scamper]

I believe that C-22 bitters was originally intended for sour orange rootstock alternative for grapefruits. I am wondering if there is any reason to believe it would have poor compatibility with kumquats.

[Galatians522]

Unfortunately, I can't speak directly for C-22 Bitters, but I can tell you that Swingle is NOT compatible with Meiwa Kumquat. 100 trees all died in the first 2 years after budding.

[pagnr]

I purchased a Meiwa some years ago, it went ok for a while, then the graft died. The rootstock turned out to be sweet orange, which grew back well. Probably incompatible.
Also similar situation with F . hindsii and Calamondin on Swingle, both did ok for 4 years, then scion died.
Never seen C 22 bitters here, but hopefully this info may also help ??
C 22 bitters is not exactly a Swingle sibling, as Sunki mandarin is one of the other parents.