I would rather pick up brass at the range than use brass prepped by someone else.
IMHO your chances of getting !F are better,
and the residue in the pocket may indicate 1F,
and I can be confident it has not just been FL sized (too small) in a die adjusted as per manufacturer's instructions.
As suggested, inspect the case head to wall junction (with a dental pick or sharp bent paperclip) feeling for a radial groove inside the case.
My first firing of any new to me brass is with a lead boolit seated hard into the lands to fire-form for MY individual chamber.
Good Luck, YMMV.
|