A projectile includes a body, a payload within the body, a target system
within the body for affecting operation of the projectile, and an
inductive interface which, as part of the target system, permits transfer
of at least one of power and data between the target system and an
external setter system. The inductive interface includes a magnetic core
comprised of a compound of ferrite material and non-ferrite material and
a coil wrapped around the magnetic core.