What I was told was that they did a run of the 107 TMK in 6mm. But that they didn’t sell. One tech said they were never marketed and the sales guy said “at the time we had more economically viable projects”. So I got the impression they were never introduced to market, but were an R&D project.
The tech explained that he personally shot all of the ones he had from that run until he ran out and loved them, has been harping on them to make it again. He did say he personally thought 1:8” twist was a tad light for them and liked his 1:7” twist better.
So yes it was in 6mm and yes they still have the tooling to do a run, it was suggested on the side that pushing a 6mm 107 TMK might be the best way to get the ball rolling as it has the least time/effort expenditure to test the waters.
Apologies if I wasn’t as clear as I could’ve been earlier.