Fire arm casing for resisting high deflagration pressure

A casing for a firearm cartridge, comprising:

• a sleeve having a concavity, a length, a central length axis, a first end having a mouth for receiving a bullet, a second end having a cylindrical wall portion, a bulkhead having an exterior surface running radially inwardly from and integrally connected to the cylindrical wall portion at a sleeve outer edge, and a nipple having a bore connected to the concavity, the nipple extending lengthwise from the bulkhead;
• and,
• a base having a length, a central length axis, a first end, an opposing second end shaped for mating with the bulkhead, a first cylindrical outer portion at the first end, a second cylindrical outer portion at the second end, a cannelure situated between said cylindrical outer portions, and a central passageway running lengthwise between the first end and the second end;
• wherein the bulkhead exterior surface is in abutting contact with said base second end and said nipple is positioned within said passageway;
• wherein the bulkhead has at least one circumscribing wave that provides a depression on said bulkhead exterior surface and a related void space between the bulkhead and the base;
• wherein the bulkhead comprises a conical portion having a first diameter end and a second diameter end, the second diameter end extending lengthwise in the direction of the base first end and being smaller than the first diameter end;
• wherein the second end of the base has a conical portion shaped for mating with the bulkhead exterior surface;
• wherein the bulkhead further comprises one or both of (a) an annular flat portion connected to said bulkhead conical section at the first diameter end, and (b) an annular flat portion connected to said bulkhead conical section at said second diameter end;
• and,
• wherein the second end of the base has mating annular portions.