Hello
@pspringle ,
You will need a 12" long or longer drill bit of the correct size. The correct size will be one that will barely fit inside the "soda straw" or equal plastic tube as listed below. Most likely a 1/8" or 5/32" will be the one.
Now insert the "soda straw" or equal plastic tube down the barrel until it reaches the pellet (s) and apply plenty of lube oil and let it rest for several minutes.
Next insert the drill bit and very slowly and carefully hand drill into the pellet (s) and remove the drill bit often to clear all lead findings. If there is only one pellet it should not take long to drill completely through. Remove the drill bit and the tube and proceed with the wood dowel process.
Hope this will help,
ThomasT