Storm Tactical Pocket Coil Bound Data Book Storm Tactical Pocket Data Books have a sturdy Polydura Cover and heavy duty plastic coils. Storm Tactical Pocket Data Books will fit in a pocket, large stock pack, backpack outer pocket, etc. Storm Tactical Pocket Data Books were developed with, and tested by, Military and Law Enforcement Snipers. Pocket Data Book pages include: Come-ups, Stationary IPSC Torso, Blank Target, Zero / Calls, Dedicated Cold Bore, Diamond Target, Circle Target, Reticle Hold, Round Count, Range Estimation Formulas, Object Size Charts,Wind Chart, and Notes Pages.