Rare event estimation for static models via cross-entropy and importance sampling

A sighting device for use, for example, with a shotgun, the device employing a reticle of fluorescent acrylic polymer disposed out of the field of view. The image of the reticle is projected into the field of view by a preferably dichroic partial reflector. Windage and elevation adjustments are included for moving the reticle to zero in the device on the target in the field of view.