This used to be said of the M16 and 5.56mm ammunition

When 26,000 Soviet soldiers invaded Azerbaijan on Jan. 19, 1990, their AK-74 rifles “used the infamous 5.45 mm caliber bullets with the shifted center of gravity, which upon entering a body – unlike conventional bullets – travel in sporadic movements spiraling through the organs causing excessive pain and internal bleeding, thus increasing chances of death.”

https://dailynewshungary.com/communisms-grand-massacre-of-civilians-from-1956-in-hungary-through-1990-in-azerbaijan/

There were two claims about the M16. One was the 5.56mm bullet tumbled through the air, sometimes the long side striking a human target, thereby causing much larger penetration. The other claim was that the speed of the 5.56mm bullet caused easy deflection and if the pointy slug struck a bone, the bullet could go in another direction, tearing through flesh and organs. 

If a bullet tumbles, accuracy is lost, and a shooter would be lucky to hit anything. A "shifted center of gravity" also would cause lack of accuracy. The high velocity deflection is also not true.