Leen,
This is a common myth based on unfamiliarity with the design and use. Do a search on the forum and you will see that the advice given here is correct: Stick to S&B and/or Winchester and you'll be fine. GeCo and Lapua will not harm the pistol, but GeCo is a bid mild and will not always trigger the hold-open after the last shot.
If you are afraid to shoot your pistol, then don't.
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