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touch hole liner size

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chuck-ia

45 Cal.
Joined
May 29, 2005
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Getting ready to inlet a col virg. lock from jim chambers, .54 cal. smooth bore, oct. to round, 1 inch across the flats at breech. Would I be ok with a 1/4'' white lightning liner? Would I be wise to allow enough room in front of the breech for a 5/16 inch liner, just in case? Or just go with the 1/4'', keeping it just in front of breech plug, maybe 1/8'' or under. Would appreciate opinions. thanks, chuck
 
If you use the 1/4-32 vent liner, the center of it should be a minimum of 1/8" in front of the face of the breech plug. If it is closer than that, the tap will nick the breech plug face. The 5/16" vent liners need to be located at least 5/32 (.156) in front of the breech plug.

Personally, I try to locate a 1/4" vent, about 5/32 in front of the breech plug. With a 5/16" vent I try to locate the center 3/16" in front of the plug face.
 
I like to have the back end of the liner as close to, but not touching the breech plug as possible. Just a little bit of metal in front of the plug shoulder between that and the vent liner.

Pull the plug when you are tapping, as, you will have to clean up the inside from the tapping burrs when you're done anyway. I just used a rat-tail file for that. Sure it'll mess up the rifling in that small area. The ball and patch won't be engaging there (it'll be filled with powder), so that will be of little consequence. The main thing is the burrs so they don't snag a cleaning patch, or any protruding bit of vent liner in the bore.
 

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