Coning ?

nessy357

nessy357

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Been working on a friends CVA flinter,got it sparking good,now working on the ignition.Drilled out the touch hole to 1/16" (for starters) coned the outside of the liner.Not really happy with the result.
Who cones their vent liners and what do you use ?
Cheers nessy.
 
I don't suppose it is a spanish gun? they have a large bushing in the breach with a 1/4" vent liner screwed into it. Makes it very difficult to get the powder out near the edge of the barrel.

cheers Doug
 
It's an older Spanish CVA, the one with the pewter nose cap.
It has a SS vent liner similiar to a Jim Chambers only smaller dia.
I have a J. C. white lightning I could install,my plan is walk the owner through the different stages, and gauge the improvements.
Right now there is too much delay from the pan to the charge.
Do you think the outside coning helps?
Cheers nessy.
 
It won't hurt as long as you don't cone all the way into the larger hole inside. I think the real problem is the small liner which reduces the ability of the powder to get out into the liner. Maybe try tapping the barrel with your hand with the barrel pointing up, before putting the ball down.
The type of gun I am thinking of in the percussion form, has a drum screwed almost all the way through the barrel (both sides). In the flint version, this drum becomes a bushing with the liner screwed into the bushing. I am not convinced it is an easy thing to modify. It would difficult to go to a larger liner in the bushing and further difficult to remove the bushing and replace with a liner because you still have a threaded hole on the far side of the barrel.

cheers mooncoon
 
Make sure the liner doesn't reach too deep into the chamber - might interfere with powder getting to the back of the hole. FWIW I drill to 5/64 usually which is close to the factory guns. Helped with a spanish pistol, but YMMV... Relationship of the hole to the pan floor may be an issue too, if the pan is a bit deep to the hole. You may have to place your priming powder differently than you're used to. I can't see a need to cone a liner ordinarily...
 
use the chambers white lightning, ,you must cut it off to the excess so not to block the barrel , drill and tap a piece of 1/16 metal screw in your liner, cut it off unscrew, you should have clean threads, you may dress the cut edge with emery, ,,dont get carried away making the touch hole bigger, 1/16th, thats what i do ,wade
 
I think Wade and Skip are missing the point; if you check my previous post, I think Nessy will find that the liner is a 1/4" diameter while I think most Chambers liners are 5/16". Further I think that the bushing that the liner screws into has a relatively small hole making a 90 degree turn into the main barrel and these two features tend to make it difficult for powder to get out close to the surface of the barrel at the touch hole.

cheers mooncoon
 
On my spanish pistol, the liner goes directly into the breech pit, which is bored to a smaller diameter than the bore. If the liner has a long cup on the inside, it can block 2ffg from getting near the touch hole. In my case, the touch hole was slightly less than 1/16 originally and failures to fire were frequent.
Opening the hole to 1/16 helped some. Opening it to 5/64 helped considerably. My Pedersoli pistol is directly drilled, no liner - the factory hole in it is very close to 5/64 (metric no doubt - haven't measured it.
Whether the liner blocks powder inside depends on the thickness of the breech at the pit. Coning concerns me a little - reducing the metal around the hole could result in a blowout under some circumstances, I suppose.
With my admittedly few guns, I find the vertical distance between the pan and the hole, and the size of the hole, dictate the best priming powder position. The "textbook" position of the powder distal to the hole doesn't work reliably with most of my flintlocks. Generally they fire more happily with the powder ramped up to the hole (but not over it.)
 
Thanks everybody your advice is appreciated.I just got home from a shoot and tried to contact the owner to get the rifle from him.I'm still waiting to hear from him.When I get it I'll post pics of the vent etc. The pan also needs to be dremelled, it's pear shaped :confused:

Cheers nessy.
 
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