[Unclenick]

The propane will require heating a large area of the bolt to reach the necessary temperature and will heat too much of the bolt. An oxy-acetylene torch will focus the heat better. Even then, it is a good idea to have a heat sink (a chill) on the bolt body to keep it from getting too warm. This may be one part you want to have a gunsmith do. He can get you a sharper angle by cutting the handle off and relocating its angle and welding it back on.