That TMK in 223 is a hella bullet…I’m sure in 308 is nothing to play with either.Sierra also makes a Match King Variant with a Green acetate tip called the TMK. Lots of F-Class shooters use it. It has a G1 BC of .535 which is much better than the standard SMK. Not sure if the T308T uses the same bullet.
I got some of them 77s to try out for my Tikka