Board Thread:Manga/@comment-34196931-20190808205129/@comment-37493549-20190901140743

Armor Piercing and Hollow Point aren't the same thing, in fact you sacrifice effectiveness against armor with hollow points because they're more fragile.

Also even if the rifle did pierce the titan's nape, unlike a pure titan the nape itself isn't the weak spot of a titan shifter. You'd need to hit the shifter himself in the head within the nape which is next to impossible since they're concealed within it. Magath couldn't manage this against Zeke even with a direct hit to the nape with a massive cannon.