08-15-2022, 11:42 PM
Has anyone run some of the original Alexander Arms pressure-tested load data through GRT? I remember that the Quickload program at the time (roughly 2006) would predict higher pressures than measured with test barrel. I wonder if GRT will do the same. A couple of sources speculated that the primer would start moving the bullet before the main charge ignited. By the time most of the charge went off, the bullet had moved enough that there was more volume in the case. In a recent Hornady podcast, one of the guests mentioned a similar thing, although he did not mention the Grendel by name. If I remember correctly, some people got better agreement with reality by inputting a slightly larger case volume.