The New .375 H&H Magnum Shell Bullet Pen. Designed after the original Fisher Bullet pen by Fisher Space Pen, this pen uses a real .375 H&H Magnum Shell (inert of course!). This is the perfect gift for the Hunter or avid outdoorsman. Fisher Space Pens write in temperatures from -50º to 250ºF, underwater, in zero gravity, at any angle-even upside down! That"s why they"re the choice of ski patrols, search and rescue teams, law enforcement agencies, armed forces, and anyone who demands writing reliability in adverse conditions. blister packaging