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Neck sizing for the same bolt action rifle is fine. It may even be better than full length for both accuracy & case life.
however You will eventually need to full length re size after several loadings as the brass will expand a tad & it'll eventually get hard to chamber. After one full length re-size you go back to neck sizing only again.
I switched to an electronic scale, but more for convenience than accuracy, both types will measure to 1/10 Gr.
Once you get a consistent technique a volume thrower is every bit as accurate as weighing every charge, till then there will be some variation. When throwing a volume charge with a meter check every 10 rounds, but not with a single throw. Throw 2 & check the weight of a charge X2. (this allows for minor inconsistencies).
Yes you should clean every time. Hard abrasive firing ash will build up & eventually mar the brass & the chamber.
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