| 摘要 |
The firearm cartridge has an upper chamber adapted to house gunpowder and a bullet, a lower pocket adapted to house a primer, and a flash hole extending there between. The lower pocket has a ledge disposed generally perpendicularly to the flash hole. The flash hole is formed with a perimeter wall that has a convex curvature adjacent to the ledge of the primer pocket. The convex curvature of the flash hole perimeter wall can either be a continuous curve, or can be approximated by a series of smaller facets, as might be produced in various manufacturing processes. |
