Greetings @Lurch,
Welcome to the giant rabbit warren of handloading. Consistency is the key. Keep your cases in batches and load them all together at one time. This keeps the loading history the same. As far as case prep goes less is best. A neck chamfer inside and out plus running the expander button in and out of the case neck is all that is generally needed. Do not FL size. Buy decent quality new cases. No amount of fiddling is going to make an average case into a good one. Resizing of belted cases is tricky and can take some specialised kit to remove a bulge in front of the belt if you are sizing to just bump the shoulder back a minimal amount. FL sizing with the die down hard on the shell holder can result in very short case life. Rather than worry about SD I would suggest some accuracy testing at the maximum ranges that you are likely to be shooting. Hard data is worth more than a pot full of opinions.
Regard Grandpamac.
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