Think you will be doing yourself a favor if you learn to anneal your brass. Anneal 1st, then full length resize just enough to push the shoulder back .003'. Your retired brass, should be good brass to learn with little or nothing to loose with your 5 times fired brass.
Search candle annealing & cordless drill annealing for starters.
This vidio touches well on over annealing.
https://www.youtube.com/watch?v=fiIrLvAUh6o&t=554s
https://www.youtube.com/watch?v=0LrvUUC_98U&t=2944s
Search candle annealing & cordless drill annealing for starters.
This vidio touches well on over annealing.
https://www.youtube.com/watch?v=fiIrLvAUh6o&t=554s
https://www.youtube.com/watch?v=0LrvUUC_98U&t=2944s