As I've been developing my Android application for a shooter's assistant I've also been putting the pieces I need to make it function in spreadsheet format. The recent one I have completed was looking at the exterior ballistics problem using Pejsa's Methodology which you can read about at the link. An internet search will bring up a number of uses of it. I have provided my version of it in my downloads area. The spreadsheet can be found here.
The other one is a very simple interior ballistics calculator. It uses the Corner Method which you can read about in the documents here, please feel free to download copies. I've taken Corner's method and then fit some of the parameters to existing data for a 7mm Remington Magnum Cartridge (using IMR4350 powder), a 5.56mm NATO Cartridge (using IMR4198 powder), and a 338 Lapua Cartridge (using IMR4350 powder). It only gives the muzzle velocity and the peak breech pressure. I would take the breech pressures with a certain grain of salt but the velocities are within a few percent error. There is a "master" Mod0 copy and several variants appropriately named in the Calculator Downloads section.
Note: Please don't use the calculators themselves in the shared drive. Download a copy and then use it on your system.
Update: I have placed the App Inventor files (.aia) and compiled Android Application files (.apk) into the appropriate downloads section. The file names correspond to the cartridges.
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