I've run up to 10 grs of longshot under a 200xtp. It is critical to seating depth and certainly at or above the pressure suggestion. I had no book and only used my guns and micrometer to make my load.
If your internet worked well enough to get here, it would take you to Hodgdons reloading data site.
Your 10gr load is too much. If you were a responsible reloader you wouldn't publish [bleep] like that.
