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Start with 10gn. 13-14gn is going to be very close to or over max. Work up slowly. Heavy bolt lift = retreat quickly. Also look for extractor imprint, or a shiny mark. Primers won't tell you much...

Yes, you will see me on that thread. I have a full manual for ICI Nobel Rifle & Pistol powders. They did not publish data for Nobel 78 Shotgun Powder in Pistol or rifle as far as I know

Yeah my bit is well locked up lol

Suggest you do a lot of research on using fillers. Some still use them. They were used a fair bit a few decades back and notable writers published load info. What came up for me is that there were...