With rifle loads using partial charges of unusually fast-burning propellants, the less deterred – faster burning – granules require much less heating to ignite and can also ignite and burn so fast, in response to gases generated by primary ignition, that even a less-than-complete primary ignition can generate results that are practically indistinguishable from those that would occur in response to 100% primary ignition. This result occurs partially because such types of loads ordinarily generate far slower bullet acceleration, so that much more time exists for secondary ignition to occur before bullet has accelerated significantly into bore, compared to the situation