Don't dog pile me, but the 77 TMK is pretty good if you're stuck with AR mag confines. It kills like crazy but isn't the slickest out there. It is good enough for me to blast steel, deer, coyotes and whatever else I happen to wanna shoot. I stick with it since it all gets loaded on a Dillon and the only think I need to change is the charge weight from the AR to the CTR.
The 77TMK is an excellent bullet. I just wish they were as available as the SMK. I can find those very easy at a decent deal, so that is what I keep buying. My new Tikka 22-250 likes them: