Today we have removed the root bowl of the Magnolia. We used a technique we have used on other fair sized tree stumps in the past.
This involves leaving around four foot of trunk on the root bowl, and sawing it in half lengthwise as low as possible. Then using wooden wedges and logs driven in with a sledge hammer the root bowl is split in two.
We did this today without digging out the bowl by sawing the exposed half again lengthwise and splitting this in half again. We pulled each quarter away from the rest with a small hand winch.
The remaining half still attached to the ground was again sawn and split with wedges. The remaining quarters were winched out after a few roots were cut through with a root axe.