A search has shown that this subject has been discussed before, but I would like to get some recent opinions. I have been reloading cast bullets since 1975. I read the first edition of the Lyman Cast bullet handbook and I started from there. I read the original article about Cast bullet loads in military rifles published by C.E Harris that I liked very much because of the systematic approach. Since then I have shot many .. many thousands of cast bullets. Recently I have seen a lot of discussions on German reloader forums that the powder volume should not be lower than 80%. Vihtavuori mentions in their 2021 reloading guide (german version)." Risk of detonation through reduced loads etc" Quick Load also warns for a SEE. Are these warnings, caused by product liability concerns? More discussions on the internet? A mystery factor created by infallible people who won't admit that they could have put a double charge in the case? I have only used fast-burning pistol and shotgun powders or the fast rifle powders like N110.
Please help to put my mind at ease.