Maybe, maybe not, just depends on the shape of what you have. I shot a ton of Barnes and just finished my load developement. Barnes has a racket going with that advertising claim. A knight jag, Spin Jag , Lehigh Jag, TC Super Jag all fit that bullet shape. I even tried some others and did not see any deformation only some markings. If you really hammered on it of course it will deform.