Well, I finally got out and shot some 143 MTAC's out of the 8" twist 6.5 WSM. Didn't quite stabilize as you can see in the pic. 2 out of 5 did stabilize, but the ain't good enough
Rhian, I've got 45 left over if you want them, otherwise I'll ship them back to Cutting Edge. They are exactley the same dimensions as the 140 MTH's, just no HP drilled into them. They would probably make a good coyote or wolf bullet for good pelts. A wuff or two might run off a ways and not get found... oh well
This was pressure testing load development. Velocities were pretty good with RL33. Elevation was 4000', baro 5 miles away at Three Forks was 30.12 and temp was 23.