you need to trim to length and debur inside and out first...... but if your reloading guru who is teaching you says to do so...it would be downright rude to not do so while still under his tutorage.... did you ever work out what caused the dings on sized case being chambered??? maybe part of reason he is suggesting it for your rifle.
WHEN you buy LEE case length trimmer you will have handy gizmo to hold base that goes in cordless drill......lots of jobs are much easier then....
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