07-28-2022, 08:11 PM
At about 8:20 in the video they mention an issue that often occurs with the Grendel: the pressure from the primer ignition is enough to start bullet movement before the main powder charge ignites. In other words, by the time the main charge of powder begins to burn, the bullet has already moved foreword enough that the effective case volume has increased. This is why some programs like Quickload tend to overestimate the chamber pressure.