What kind of bit for drilling exhaust?

[Jwebb]

Iam new to call making but have made some great progress on my toneboards. but iam having a problem boreing out the exhaust. I was curious what type of bits people use to bore them out. iam about to try a step drill bit. Is that the best way to go or is there another.

[James Strickland]

I use a stepped bit, as I think most others do as well.  You can also get a stepless bit if you want a smooth bore on your exhaust.

[FDR]

Drill with the step bits and for a smooth channel follow up with these.
http://www.harborfreight.com/3-piece-stepless-drill-bits-66463.html

Fred