Loose powder will not burn in a consistent manner. (and at worst will disperse into the vacant space with the cap charge and burn semi-explosively as a distributed/granular-aerosol instead of a train.)
In theory maybe but not in practice.
Loose powder will not burn in a consistent manner. (and at worst will disperse into the vacant space with the cap charge and burn semi-explosively as a distributed/granular-aerosol instead of a train.)