I have been working uo a maximum load load for the 10mm. I am using a stock G20, 180 grain bullets, and 800x. I startyed at 8.5 grains, the listed max, and worked up in .5 grain increments. I am up to 11.0 grainswith 800x and 180 grain tmj with no pressure signs. I only fired three rounds as I know I am way over max. I was just trying to see at what level I would see signs of excess pressure and I have not yet. I am not going to go any higher, just wanted to know what you guys think. Thanks, Jon Wanna kill these ads? We can help!