Nickel plated cases being porous enough to carry abrasive particles into the dies causing scratches seems a bit like flyschitt in the pepper to me. But hey, what do I know.
Definitely more flyschitt than pepper. I've been using Winchester nickel plated brass for almost 9, maybe 10 years exclusively for my .280 Remington. I use it because it's the easy way to tell my .280 Rem. and .270 Win. brass that get tumbled together when I'm working with both cartridges. My .280 sizing die is working just fine, no scratches, no abrasion, no problems. I anneal on the fifth reload cycle and no necks have split from the get go. Methinks that may have been a problem in years long past, but is most likely negligible with current production brass.
Paul B.
