new cases do not need resized, a lot of them are dented or bent around the mouth or neck. I usually neck size them about half way down the neck to make them round again then chamfer the mouth to get rid of the burrs, then they should be good to go.
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i would resize all new cases, as i,ve noticed the lenghts of new cases can be 10- 15 thou different. as such, i treat all new cases as though they were picked off the ground at the range.