9mm getting deformed

HKUSP45C

New member
Hi
Does anyone know what is causing the 9mm rounds to pinch and deform in my 229 mags? Is the the indents on the side that is doing that or is it the force I put when I load it. (strong spring)
Would those speed loaders solve the problem?
If it helps, it does it on the factory Sig mags as well as the Mec Gar aftermarkets.
HK
 
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