Exactly. No reason NOT to resize new brass & match all your other sized brass.
Besides, you're not going to send your fired brass back to their manufacturer & have them resize them each time, right.
I've found new brass is often several thousandths fatter before I resize it. I like good bullet-case tension on my jacketed bullet magnum revolver loads.
If I want less bullet-case tension I use the appropriate M-style expander die.
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Some of my Lee pistol FCD dies had carbide rings that were undersized & tried to resize no matter what bullet I used.
On several cartridges (40S&W & 41MAG) I removed the carbide ring because of that. On the other FCDs they've not been a problem.
Initially I was a fan of them but mainly I see no reason for them anymore.
Lee rifle FCDs are a different story.
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