Just finished converting 556 brass to 25-45 brass.
300 pieces that needed to be de-crimped with the Dillion and then trimmed.
I use a Lyman trimmer that i have turned down the shaft to fit my 1/2 drill.
Turn it slow and just get them 10 or 20 at a time.
Thing is to take breaks so you don't screw up.
Last time i got tired of trimming was when i was doing a 1000 for someone.