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Yep, total shocker. What brand??

Clearly ;-)
I'm only going on my experiences with 30+ factory die sets. If upstrokes were gritty, it almost invariably pointed to inadequate lubrication as neck walls aren't thick unlike...

I'm not sure what relevance this has to the outside-of-case marks. Also, from what I've seen of the smoothness of most expander balls, this may roughen up the inside of the neck, not improve it. At...

Stop using Speights as the lube

A die will only give you longitudinal scoring, not circumferential. DEF suspect it's chamber machining marks.