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Steel Dies scratching cases
I have "studied" the reason why clean brass sized in a steel sizer die will eventually have small scratches (scores) on them when sized.
Starting with a clean die and clean brass...tumbled clean and then lubed.... After sizing a few I have found that the subsequent cases come out slightly scored. Wiping them and polishing them lightly with five steel wool, the score marks on the cases are gone..but why did they form? It is from primer residue! Ok, so now deprime and clean out the primer pockets, then tumble clean and lube them--no scoring!
The minute scoring on a brass cartridge case doesn't seem to shorten case life, except it will make the case neck prove to splitting. On rifle brass after I size it, I wipe the case lube off and then twist the neck of the case with fine steel wool. This seems to make the case life length longer for me.
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