Having read this thread I thought I too would try 77 TMKS in my 12fv.
For reference my pet load is 69SMKs at 24.6 grains of Varget. Consieved accidentally as they turned out a COAL 2.237 VS the 2.298 I had intended. They shoot very well. Less then .5moa at 100 and under 1 moa at 200.

So today I gave the 77 TMKS a try. With ten thousands jump the COAL is 2.385. Powder was 21.8 and 22.0 varget.

Accuracy at 100 yards was good. Matching my 69s. With only a few rounds left I tried the 77s with 21.8g varget a try. Oh boy, they sank like rocks and the group really opened up.

So I'll load some up at 22.5 next time out.

How did everyone else do when moving out past 100 yards?