FREE Airgunning Atlanta Ballistics Spreadsheet
FREE PCB Ballistics Software
The "A" Team ATEAB Software
Eric Sander's ScopeKnob Software
Ian Pellant's Airgun Software
Chairgun Ballistics Software (Now from Hawke Optics)
An excellent collection of ballistics software is available from SniperCountry.
Kevin Allen has done a sheet of labels for yardage tics on sidewheels (or, perhaps, bells). The document here is designed to be printed on Avery Waterproof Label Stock DL1125. Label stock is available in many colors and transparent sheets. Be sure to get stock compatible with your printer. Kevin suggests covering the labels with shipping or other heavy-duty tape.