I've got an unpainted barrel and have it all marked, but I'm having a devil of a time drilling the holes. I'm using a Dewalt 0-2500RPM electric drill. I'm using cutting oil. I've used a center punch on all the holes. But when it comes to drilling, I'm having next to no luck. After a day, I've got all the 1/4" holes on the lid drilled, but the bit is toast. I still have all the 3/4" holes on the lid and the holes on the drum. Is there a secret for drilling that I don't know?