I am not sure where I have heard this “rule” I think Glen Stanoz told me that. It is a great guideline to go by. Also the argument can be made that as a tree goes from a rod to a cylinder as it decays making it stronger, to a point.
It may be a defect but 70% or more hollow the tree is condemnable. 70% or less hollow is not condemnable. No targets I would leave it. But over a house or other high value targets I would tell the owner “it is best to take it down on your time line than natures time line”
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