The nickel is 'flash plated' on these cases and if you look inside the case necks with a magnifying glass you'll see tiny beads of nickle clinging there in various amounts. Bottom line the beads can imbed in the bullet and scratch bore upon firing and can also affect 'bullet pull' with its accuracy problems, etc.
BUT, they are nice to look at and won't get verdigris in leather belt loops which was the original intent of nickel plating. Police officers were happy for this, and they don't reload, or buy their own firearms in general.
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"Use a big enough gun!"
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