Sorry to rehash an old post but I was browsing through the forums and noticed a TCM  discussion so I thought I would throw in my two cents.  I have some experience with working up TCM loads in odd calibers like .480 Ruger, .500 JRH, 9x23 Winchester etc.  During the "great powder shortage" I was looking for odd powders I could use in place of the typical magnum pistol powders like 296, h110, 4227, AA9.  I purchased 10 lbs of TCM and started tinkering and had good performance in all the calibers listed.  After speaking with an engineer at Western Powders he informed me that TCM falls right in the middle of AA9 and 4100 and to use AA9 load data and work up from there.  In my opinion I would say TCM could be a viable option in 10mm with heavy bullets.