You'll need to resize (neck or full-length) or you won't get enough tension to prevent setback - assuming you're loading for a levergun. Trim if you want, but it is not necessary. Chamfering isn't a big deal as long as you flare before seating. I've never seen a plugged flashhole from Starline, but seems like I always "peek" before I prime.
I use Lymans neck-sizing die, and do about 9/10th of an inch - saves on the grunting/groaning of full-length resizing. I shoot a Guide Gun.
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