So after some promising results with H110 I shot into town to pick up some Lilgun as Ive read its the go to powder in hornet at the moment and found some mentions on forums of guys using it to load for their TCM pistols.
I looked up Hodgdons data for Lilgun in .22 K hornet as I did for H110 and got the min load of 12.5gr and a max load of 13.5gr. I dropped 12.5gr in and headed out to the chrono... then all hell broke loose.. 3328fps
https://preview.ibb.co/ixo2OL/20181031-173939.jpg
https://preview.ibb.co/icWdxf/20181031-173952.jpg
I thought all was well as it was a light starter load according to Hodgdons Hornet data and I didnt even know it had blown a primer pocket until I lifted the sticky bolt. The pocket has stretched big enough to fit a large rifle primer! The tough little Mauser action did its job perfectly and vented the gas through the actions relief hole and I could trace the sooty gas trail across the various steps and machined faces designed to keep the shooter safe in a burst primer scenario such as this.
I cant quite work that one out as H110's pressures and velocities aligned perfectly with their data but will try again tomorrow from a start load of 10gr of lilgun.