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Wolf ammunition is manufactured using cases made of fairly hard steel, instead of brass. This is because brass is/was a great deal more expensive in the USSR/Russia than steel, which was/is lying all over the place thanks to Stalin's huge industrial buildup in the 20s and 30s. The extractors of pistols are typically much smaller than those of rifles, and are designed to deal with brass casings; brass being much, much softer than steel the part is not damaged. However, if the casing is steel it will frequently damage or break the small extractor's claw, resulting in an inability to extract the fired casing and a double-feed.
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