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I know with some pistols it is possible to load 9mm rounds in .40 cal mags. Is it possible with the p-99 or sw-99?

thanks
 

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I tried loading 9mm in a factory .40 and they looked OK, and would chamber and eject when working the slide manually. They did not feed reliably when shooting, though.

When I put the 9mm magazine back in, everything worked fine. I did not try it with any of my other factory .40 mags, though.

This was a P99
 

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It all depends on what you're looking to do. If you're looking to screw around playing with 9mm in a .40 mag at the range is one thing. If you're counting on the pistol to save your butt when the chips are down, don't even think about putting 9mm rounds in a .40 mag.
 
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