The loading of the highly explosive and exceedingly sensitive mixture into the primer cup or cartridge rim of rimfire ammunition is a very delicate and dangerous undertaking. With most commercial primers, this is done with the compound slightly wetted, but in military primers, it is carried out as a dry powder to give a more consistent result.

In the 'Eleyprime' process, a mixture of dry, relatively safe chemicals is placed into the primer cup. On the addition of a small quantity of water, the chemicals react to form an explosive composition. Basically, the mixture consists of tetra-zine, lead monoxide, lead dioxide, antimony sulfide, styphenic acid, barium nitrate and calcium silicide.

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