Abstract: The method of hermetically sealing the ammunition between the bullet and casing of an ammunition round and establishing a jacket with a soft, lubricous, plastic inner layer of hydrogenated vegetable oil and a thin hard, dry frangible outer layer of carnuba wax on and about the bullet forward of the casing and about the forward portion of the casing, said method comprising dipping the bullet and forward end of the casing in a heated molten mixture of oil and wax and permitting the round to heat sufficiently to expand and drive air and moisture out of the casing between the bullet and casing, extracting the round from the solution and first chilling the surface of the solution on the round to cause the wax at and adjacent to said surface to coelesce, set and harden, whereby the outer layer of the jacket is established to contain the inner layer and to thereafter permit the round to cool and the oil and wax beneath the outer layer to solidify.