I doubt that you would notice much difference in powder charge from full length to neck sized. If you chronoed before and and chronoed after neck sizing to see any difference, that would tell you, and also if it shot to the same poi and are as or more accurate would tell the story. I love the Lee collet die, but much prefer Forster seaters. I don't own a 280, but that is a dandy cartridge. my 2cents.
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