This project begins with a 5/8" X 18 grade 8 bolt.







After the head of the bolt is cut off, it was trimmed, and squared to a length about 0.020" longer than a OEM CVA plug.







Then a rebate is made in the end of the plug, so it can marry with the barrel.







One of the reasons to make a CVA plug, is so one can make a 'powder pocket'. A powder pocket seems to provide more reliable ignition using BH209.













Then the flash channel was drilled with an eighth inch drill.








Now is the time during the making of this breech plug i get nervous. The plan here is drill a flash hole with a #69 drill through about 3/16" of hardened steel. If the drill sticks, and breaks, all the previous work is for naught.







It is just wonderful when it works. Now i set out to form the primer pocket. A good reason to make a breech plug is so one can adjust the depth of the primer pocket, and the length of the breech plug, so one gets a little 'crush' of the primer of choice. If the crush is done correctly, there will be no blow by.









The length of the OEM plug and an STS primer is 1.289".









My goal is to make the length of this breech plug with primer inserted longer than the equivalent measurement of the OEM plug. One can't make this length too long, or the rifle won't go into battery. If the length is too short, there will be no 'crush'. Different rifles, and different primers require different lengths, so coming to the correct length is a guess and by golly situation.















I can't know if the 1.311" length will work in my rifle without trying it. If it is too long, the powder end can be sanded shorter. It isn't very likely it will be too short, because it is longer than the OEM plug, but if it is too short, going to a longer primer may be the fix. If it is too short for all primers, then an O-ring can be used. More work needs to be done, before a trial, but i am tired, so the work and testing will have to wait.