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When I cut a chamber,after it is roughed to near finish depth,I scrape,stone polish a small radius to break the sharp edge at the chamber mouth.The rounds do have to turn around that corner a bit as the feed.If it is sharp,it can cut into the brass,as it seems yours is doing.
Now,it is also possible mag feed lips or something silly like a fouled ejector plunger are involved.I'd check all that out before getting excited.
But it may be necessary to break the sharp edge off the chamber,if it is sharp enough to cut brass.
It is one of those things a person who does not know quite what they are doing can mess up very badly.
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