Breech plug with primer pocket for converting a black powder gun to smokeless powder

Abstract

The breech plug with primer pocket of the present invention converts a black powder propellant muzzle-loading gun to a smokeless powder propellant muzzle-loading gun by providing a close fitting primer pocket wall, a flush fitting extractor that also supports the primer's sides, and a primer pocket seat that is cut at an angle of 25 degrees from the perpendicular of the primer pocket wall to conform to the front face of the primer, such that when the primer is seated against the primer pocket seat, a gas seal is formed. A gas seal is also formed at the primer's side walls.

I claim:  
     
         1 . A breech plug with primer pocket for converting a black powder propellant gun to smokeless powder propellants, comprising 
 a smokeless powder propellant breech plug sized to be closely removably fit within the breech of a black powder propellant muzzle-loading gun, with a breech opening at a first end of the plug and a primer pocket at a second end of the plug with means to pass smokeless powder propellant gas from the primer pocket to the breech opening, wherein the primer pocket is substantially cylindrical in shape with a diameter of about 0.2435 to about 0.2450 inches that is open at the first end of the plug and that has a primer pocket seat at the opposite end in direct communication with the means to pass smokeless powder propellant from the primer pocket to the breech opening, the primer pocket seat having means that conform the shape of the primer pocket seat to the front face of a primer filled with smokeless powder propellant to form a gas seal between the primer pocket seat and the primer, and    primer extractor means flushly fitted against the primer pocket to support a primer wall and to eject a spent primer from the primer pocket.    
     
     
         2 . The breech plug with primer pocket of  claim 1  wherein the primer pocket and primer pocket seat was formed with a boring bar with a lead angle of about 25 degree at the second end of the plug to a depth of about 0.299 to about 0.306 inches.  
     
     
         3 . The breech plug with primer pocket of  claim 1  wherein the length of the plug between the first and second ends is about 1.318 to about 1.320 inches.  
     
     
         4 . The breech plug with primer pocket of  claim 1  wherein the plug is removably fit within the breech of a black powder propellant muzzle-loading gun with means to thread the plug into the gun's barrel.