Most cases require full length resizing or at least a shoulder bump after a certain amount of neck sizing. This especially so if you load very warm to hot loads.
There is some controversy as whether neck sizing offers an accuracy advantage over full length sizing. After over forty years of reloading, I personally believe it depends on the particular rifle being loaded for - some rifles it does and some rifles it doesn't.
Makes sense to trim after resizing - neck, shoulder only or full length.
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