Olpea,
My experience is callery like all rootstocks like some pears better than others. Duchess, Kieffer, seckel. Clapps favorite, Douglas, Clara frijs all take without issues. Duchess will be delayed and look like it did not take because it will be a month or two until it leafs out. Ayers was hit and miss as were many others so maybe 50-60% takes. Chojuro on my trees was 100% fail 100% of the time as an example. A friend mentioned similar experience with ohxf rootstocks with certain pears. Scott mentioned his experience is bet may be to vigourous for certain European pears but perfect for Asian pears. Harbin pesr rootstocks will not work many times due to decline for European pears but are used for Asian pears sometimes. Certain euro pears, I would even say 3/4 of the European pears callery are wonderful rootstocks for them. I have a 20 year old callery I have top worked twice never had a disease such as fireblight or scab etc. They are very hardy , very rodent resistant etc. Callery are great euro rootstocks but remember some wild trees graft easier than others. If you get a rootstock that rejects everything try Clara frijs or Douglas they have 100% takes for me.
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