A cartridge comprising a cartridge case with a head assembly and a load carrying projectile fitted to said cartridge case, said projectile having programmable fuze electronic circuit mounted therein at its forward end and an electrically conductive cylindrical tracer container for tracer compound or base burner compound or a rocket motor system positioned at the rear of said projectile, said cartridge further comprising: an electromechanical electronics-setting circuit present within said cartridge for transmitting an electrical setting signal originating from an external fire control system through a head assembly contact to said programmable fuze electronic circuit, said circuit comprising: a) an electrically conductive rear tracer contact positioned within the cartridge case for receiving and seating a electrically conductive tracer container; and b) a first electrically conductive pathway extending from said head assembly contact to said rear tracer contact as a first portion of said electromechanical electronics-setting circuit; c) a second electrically conductive pathway extending from said rear tracer contact to said programmable electronics as a second portion of said electromechanical electronics-setting circuit; wherein: d) said electrically conductive rear tracer contact and electrically conductive tracer container are electrically insulated from said cartridge case; and e) the electrically conductive tracer container is slideably engageable with the electrically conductive rear tracer contact, whereby, by the mechanically seating of the electrically conductive tracer container into said rear tracer contact, a portion of said electromechanical circuit is simultaneously established; and whereby the second electrically conductive pathway is made up by the electrically conductive tracer container, a forward tracer contact assembly, a conductor, a fuze contact, a conductor, and the programmable fuze electronic circuit; f) a return portion of said electromechanical electronics-setting circuits provided by projectile outer surface, an unpainted driving band and/or cartridge case, which overlaps with a portion of the driving band and is electrically connected to a head assembly holder. an electromechanical electronics-setting circuit present within said cartridge for transmitting an electrical setting signal originating from an external fire control system through a head assembly contact to said programmable fuze electronic circuit, said circuit comprising: a) an electrically conductive rear tracer contact positioned within the cartridge case for receiving and seating a electrically conductive tracer container; and b) a first electrically conductive pathway extending from said head assembly contact to said rear tracer contact as a first portion of said electromechanical electronics-setting circuit; c) a second electrically conductive pathway extending from said rear tracer contact to said programmable electronics as a second portion of said electromechanical electronics-setting circuit; wherein: d) said electrically conductive rear tracer contact and electrically conductive tracer container are electrically insulated from said cartridge case; and e) the electrically conductive tracer container is slideably engageable with the electrically conductive rear tracer contact, a) an electrically conductive rear tracer contact positioned within the cartridge case for receiving and seating a electrically conductive tracer container; and b) a first electrically conductive pathway extending from said head assembly contact to said rear tracer contact as a first portion of said electromechanical electronics-setting circuit; c) a second electrically conductive pathway extending from said rear tracer contact to said programmable electronics as a second portion of said electromechanical electronics-setting circuit; wherein: d) said electrically conductive rear tracer contact and electrically conductive tracer container are electrically insulated from said cartridge case; and e) the electrically conductive tracer container is slideably engageable with the electrically conductive rear tracer contact, whereby, by the mechanically seating of the electrically conductive tracer container into said rear tracer contact, a portion of said electromechanical circuit is simultaneously established; and whereby the second electrically conductive pathway is made up by the electrically conductive tracer container, a forward tracer contact assembly, a conductor, a fuze contact, a conductor, and the programmable fuze electronic circuit; f) a return portion of said electromechanical electronics-setting circuits provided by projectile outer surface, an unpainted driving band and/or cartridge case, which overlaps with a portion of the driving band and is electrically connected to a head assembly holder. f) a return portion of said electromechanical electronics-setting circuits provided by projectile outer surface, an unpainted driving band and/or cartridge case, which overlaps with a portion of the driving band and is electrically connected to a head assembly holder.