Jacob Hess Apps

Designed by Bryan Litz, Applied Ballistics,this collection of utilities is especially useful for long rangeshooters. Many calculations such as bullet stability, sight scalefactors, density altitude and more are collected in thiseasy-to-use package. Regardless of what ballistic solver you use,this toolbox is a valuable tool that puts many common calculatorsat your fingertips. The Applied Ballistics Auxiliary Toolboxcontains the following useful utilities:Spin Doctor:Calculate the gyroscopic stability of your bullet based on yourbullets: caliber, weight, length, velocity in your specificatmosphere. Spin Doctor answers the question about what bulletswill be stable in your rifle. Furthermore, Spin Doctor tells you ifa particular bullet is under stabilized, and how much the BallisticCoefficient (BC) of the bullet may be compromised due to marginalstability.Spin Doctor contains a bullet library which includes bullet:length, weight, caliber, G1 and G7 BC's. In this way, the SpinDoctor app also functions as a basic BC look up. The bullet/BClibrary contained in Spin Doctor contains all the live firemeasured BC's that are published by Bryan Litz in: "BallisticPerformance of Rifle Bullets".The Spin Doctor app works with English and metric units.Density Altitude:The Density Altitude (DA) utility calculates DA based on variouscombinations of environmental data. English and metric units aresupported as well as barometric pressure and altitude vs. stationpressure. This utility is useful just to see, for example, how mucha given temperature or pressure change affects your DA.Sight Scale Factor:One of the most common reason shooters miss targets at long rangeis because scope turrets don't always track accurately. Forexample, you might dial 30 MOA but only get 29 MOA from your scope.The Sight Scale Factor (SSF) utility allows you to calculate ascale factor to correct your calculated drop based on your scopeerror. The way it works is, you conduct a 'Tall Target Test' at 100yards where you measure your Point Of Impact (POI) shift and youinput your expected (dialed) POI shift. The calculator determines aSSF that you need to apply in a ballistics program to correct forimproperly tracking scopes, putting you on target at longrange.The SSF utility works with MILS and MOA, as well as meters andyards.MIL Ranging:The MIL Ranging utility calculates range based on the size of atarget in your reticle.Slope Dope:The Slope Dope utility corrects your drop based on angle fire basedon the Improved Rifleman's Rule. Works with English and metricunits.Chrono-Correction:This utility corrects your Muzzle Velocity (MV) based on thedistance from the muzzle to the chronograph. When you place yourchronograph out in front of the muzzle, the velocity you measure isactually a little bit slower than your true MV. This utility allowsyou to correct for that small amount of velocity decay so you knowwhat your true MV is. This utility works with both English andmetric units.