Of course, if I had just searched for “gauss” instead of “degauss”…but whatever. Thanks, everyone.

@...Blue-fish: This is it –although this little paragraph on the “how it works” page didn’t exactly fill me with confidence:
“The pulse turn-off is the most critical aspect of timing. If any of the magnetic field is still
present after the middle of the projectile passes the midpoint of the coil then the
projectile will experience a “suck-back” effect. Late turn-off could not only slow down the
projectile, it could even cause it to change direction and shoot backwards!”

www.gausspistol.com/howitworks.html