Same maple tree. This one is a little deeper and I did pull a small core out of (more to come).
~8.1" dia. X ~4.5" deep, ~5/16 wall. A little character in the wall in the center picture. Can't see through the knot but it might fall out as it dries.
Used a 50mm tenon for coring. Not smart but got to work.
C&C welcomed.