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"Bad Joke Friday" Dan (moderator emeritus)
7,761 Posts

I trim new brass before resizing for several reasons.

1. I use a progressive press, and it's much more efficient to complete the progressive cycle once it's started.
2. I've tested Winchester and Starline brass for growth after initial sizing and found it to be very uniform, thus trimming before sizing had no effect on the uniformity of the sized brass.
3. And the aforementioned problem with the sized brass not always fitting the trimming pilot.

I have also found that the brass can grow such that my press setting for bullet seating will need adjusting. After approximately five rounds of full loads, my 44mag. brass can grow such that it extended beyond the bullet seating channel. So I've found it easier to use brass for three rounds of full loads and then for target/plinking.

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