separating front hub from drum?

I'm not doubting your experience, it sounds like you have done this before but 5/8's even for the 7/16 studs? Well I can find a 5/8's easier, so do you have to cleanup around the studs as BCSCHIEF mentioned with a grinder? Do you recommend a certain brand hole saw?

Thank you.

I've never had to clean up anything. I've always cut the holes through the drum and the drum will lift right off. Now......if you're wanting to remove the studs from the hub, you might clean up a little around whee the stud comes through the hub. If you knock the studs out with too much material left on them, you can damage the hub.