This discipline encompasses those features in design such that the round of ammunition fits and fires safely in the firearm. This includes accommodating the headspace datum, flash-hole size, web, chemical constituents and shape of the propellant, bullet retention and release, and other issues.
LTC Alphin’s work as an Ammunition Design Expert led to the new A-Square family of cartridges within SAAMI (Sporting Arms and Ammunition Manufacturer’s Institute). This family was copied by Remington, Winchester, Federal and Nosler in creating new cartridge designs with improved capabilities but which worked through existing firearm mechanism designs. This was of great benefit to the shooting public.