We do not 'drill' many holes for NM, generally we punch them and use plastic bushings in the holes. The bushing must be about about 1" ID.
I don't find it is convenient to run to many cables together, I would rather just make more holes.
Where I see the bundles of NM is usually the last 5' to 10' into the electrical panels.
Ever see a bundle of NM with about a 12" OD?
