Fire Channel Diameter

[Italian Hawkin]

Hello and hope everybody is staying well. I am planning to make my own percussion powder drum from scratch for a future build. I currently have good information on all the outside dimensions of the screw in drum. However I am clueless about the internal diameter of the fire hole. I think it is an 1/8" diameter, but that is only a guess. Could someone please offer there opinion on the optimal fire channel diameter. I am planning on producing a drum with 5/16" male thread. Thanks in advance for your input.

 

[Phil Coffins]

Two trains of thought come to mind, large to move powder to the nipple and small to to get the flash to the powder. I favor small to keep the velocity of the flash high.

 

[longcruise]

There needs to be a balance between the exterior diameter of the drum and the size of the hole you drill through it. A wall thickness of the drum that will hold enough threads for the nipple to be secure and sealed.

 

[Italian Hawkin]

There needs to be a balance between the exterior diameter of the drum and the size of the hole you drill through it. A wall thickness of the drum that will hold enough threads for the nipple to be secure and sealed.

I plan on turning the O.D. of the drum to 7/16 diameter.