Can shell, and associated tooling and method

A can shell comprising:

• a center panel;
• an inclined panel wall extending at a downward angle from the center panel;
• an annular countersink formed around the inclined panel wall, the annular countersink including an inner countersink wall and an outer countersink wall;
• a countersink base formed at and connecting a bottom end of the inner countersink wall and a bottom end of the outer countersink wall, wherein a first radius of curvature between the outer countersink wall and the countersink base is different than a second radius of curvature between the inner countersink wall and the countersink base, thereby causing the countersink base to be asymmetrical;
• a chuck wall extending from the outer countersink wall, at least a portion of the chuck wall having a concave shape;
• and
• a curl extending radially outwardly from the chuck wall,
• wherein a depth from a lowest interior surface of the annular countersink to an uppermost surface of the curl is between 0.265 to 0.280 inches,
• wherein the inner countersink wall and the outer countersink wall extend generally parallel, and
• wherein the first radius of curvature is greater than the second radius of curvature.