Jasper, my version of QL has Grendel default case capacity as 35.99gns.That's a big [dangerous] difference between mine and yours. I have sealed and weighed Lapua cases as 35.13gns new unused, and 35.92gns used and FL sized. I only use the default when estimating loads for others. My QL estimates 28.2 as hottest safe load for Scrape. If a manufacturer recommends more then all good, QL is notoriously conservative.
Scrape, seeing you are committed to loading hot why don't you determine the case capacity of your own cases for safety. Seal the bottom with Blu-tac or a spent primer and fill with water - weighing the water by weighing empty, and weighing full. Do this a few times to get a reliable average. Pressure estimates will be more precise.
Scrape, seeing you are committed to loading hot why don't you determine the case capacity of your own cases for safety. Seal the bottom with Blu-tac or a spent primer and fill with water - weighing the water by weighing empty, and weighing full. Do this a few times to get a reliable average. Pressure estimates will be more precise.