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Alliant Powder (formerly Hercules)
The Ammo Dump: hard-to-get and obsolete components
Geoff Beneze's unofficial Dillon Tech and General Reloading Q & A Page
Ballistics program (9kb Zip file, runs under Excel); thanks to J. Gooldy.
Reloaded ammo costing program (130kb Zip file); thanks to J. Gooldy.
On Reloading for Gas Guns