Hello all, this is my first post here.

I am in the middle of a underhammer project, and I am ready to drill and tap the barrel for the nipple. This is my 2nd one, and a friend driiled and tapped the nipple on the last one, and I cant get in touch with him today.

My question is do I allow the drill that is the root diameter for the tap go all the way into the bore? Basically I am asking is the hole the same diameter from the nipple to the bore?

Thanks guys