I decided to develop a 6.5x55 load a little further.
As stated in a previous thread, I loaded in 0.2gn steps beyond my original (and precise) 46.5gn of N160 behind a H 129gn SST. All case, primer, crimp, COL etc details remain the same.
46.7, 46.9 were OKish.
47.1 showed smoky cases, extractor and ejector prints on the case head. The primers looked OK.
47.3 was all normal, but a relatively large group.
47.5 - 3/8" group, (2 in the same hole) and no case anomalies.
What do you think - poor obturation at the 47.1 gn point?
I would have stopped at the 47.1, but the pressure signs were light.