Matt,
Remington made a running change back to brass-plated steel on the Gun Club shells this year. They are in the new packaging. As Cold Spring noted, the GC shells started out brass-plated originally, a "cost-saving" change made to Nickel-Zinc plated steel ("silver" color) recently and now back to the brass-plated cap. There is NO difference in the hull, itself. All the STS, Nitro27, Gun Club, Game loads, etc are all the "RC" style hull with the same internal dimensions.
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