Sierra "The Bulletsmiths" Rifle & Handgun Reloading Handbook Edition 6Sierra 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