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For new brass I wouldn't go to the trouble of completely resizing the whole case but sometimes its good to run the expander ball thru them to make sure the mouths are all round.
Then if, as you mentioned you are going to crimp I would at least trim them back so that all of the crimps are uniform.
You didn't mention if these are going in an auto loader. If there not then the crimp isn't necessary. Personally I would still trim the mouths just to square them all.
Its a personal preferance. I do a lot of things that I could let slide, but then I want all things as equal as I can get them on every round.
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