Be very wary of that once fired Federal GM brass. As it has been mentioned, for whatever reason it is quite soft. I have a good quantity; for best results, I have loaded with the CCI #34 primers, which give a good fit in the primer pocket.
Trim to 2.00 inches case length, and (if you're using MatchKings) an OAL of 2.800-2.820.
Hiding in plain sight...