OK.....
Two 20ga brass brush/tightly wrapped-oiled '00' sessions w/ drill....
Two oiled '0000' sessions....
One silver polish '0000' session later....
Four boxes of the junky steel-base Winchester "SuperTarget" later...
3 harder-to-shuck/but still hand-shuckable shells,
while the the rest were "normal."
Good-to-go.
Note to myself: The once-fired steel stuff had such residual expansion that they would not go back into the chamber w/o thumb force. The once-fired AAs dropped right in.
The wonders of metallugy.....
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