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Unless you are regularly tearing the rim off your brass there is very little chance steel cases could have a negative effect on your extractor. The only other way would be if you are experiencing hard extraction and the cases are then harder to remove, causing extra stress on the extractor. But if that's the case a new extractor should be in your parts bin and be thankful for steel cases being stronger.
Don't expect a flood of cheap ammo from Wolf. Only the 7.62x39 is approved and is in VERY short supply even in the US. Only a few people are getting backorders filled.