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There is another way of racking a High Power, one that can be done one-handed.

Place the bottom portion of the leading edge of the slide (right underneath the muzzle) against a hard, stationary object and push the pistol toward that object. The slide will be fully retracted when the dustcover taps the object you're using. Allowing the slide to close will, if a magazine is present, strip the top round off and load it into the chamber.

For someone who's not as strong, two hands can be used to push on the grip, making sure to keep fingers away from the trigger.

I know my description of this method isn't the best, but once you get the hang of it, it's supremely easy, even for those not as strong.