I have used both in my Tikka .223, and the TMK shoots slightly better in my rifle than the standard matchking. The only issue is that I can't seat the TMK to the lands with the standard magazine. However I have a Waters magazine that allows me to use a COL quite a bit longer, so I have no issues seating to the lands when using that magazine.
Below is a side by side comparison of the 69gr TMK and the 69gr Matchking.
