Correct. 1" OAL is the "case length". As far as FPS? No idea. Havn't loaded any rounds and won't till I get my chambered barrels back. At that point, I'll get some fired brass and have dies cut. I had planned on building a "17 TCM" at the same time but figured I'd better start with the 20 caliber and see if I liked it before going to the 17 caliber. A couple of Guys @ Saubier are working with the TCM. I just started at the bottom and built my way up. Dies can be an issue so you have to go slow to avoid issues when making brass.
The TCM design is "proprietary" so getting reamers can be a challenge. I built a dummy round in 20 caliber and that was used that for reamer specs.