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I have a ZKK602 375H&H and a CZ550 'Magnum' (so marked on side of reciever) in 416Rigby. Both extractors look the same and function exactly alike. As the round is withdrawn from the magazine by the bolt the rim enters the extractor as soon as the round starts to leave the magazine,ie: as soon as the rails release it to rise into the extractor. This means the rim is completely under the extractor for at least half the length of the case. I don't know how much more 'controlled' the round could be.

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Thanks Zimhunter!

What you describe is what my 98's do.

I suspect "the cartridge was under the control of the magazine or the bolt at all times?" The rounds are not on my 550, tho I can on my 98 and 96.

Since CZ describes the action as a controlled feed action, and since they have told me the extractor is NOT supposed to snap over a chambered round, and since yours seem to function properly, I can only surmise that Tatume's and mine are the result of QC problems and are not designed to function/misfunction as they do.

Now, to go make some lemonade with my lemon...