You're probably referring to the TC Maxi Shok kit that contained different tips to engrave projectiles for expansion.
I never used them but there have been debates about their potential effectiveness.
I feel that hollow pointing could work depending on the velocity of the projectile.
Similar types of engravings certainly work for .22 bullets.
If there's a reason for wanting faster expansion then it's probably worth a try. It may not be effective in every situation but for some situations it just might work.