Sierra Bullets took the opportunity to expand their ballistic testing abilities for the creation of the 6th Edition Reloading Manual. In doing so, they built a dedicated range to fire and test the velocity and pressure of their reloading data. This allowed them to ensure that the loads listed in the manual would fall under SAAMI or CIP maximum pressure limits for a given cartridge. They utilized a universal receiver to act as their test firearm throughout the load development process. A universal receiver allows operators to affix specially made test barrels that are fitted with Piezoelectric transducers that are specific to the cartridge the barrel is chambered for. This is for the purpose of measuring pressure. In very simplified terms, a Piezoelectric transducer works by turning the force exerted by the expanding case into a low voltage electrical charge, which is then measured by a very sensitive charge amplifier. The charge amplifier then calculates the pressure of the shot fro...