yep the teeth were supposed to grab a bowling pin. I shot a number of pins off center with RNL and with Pin Grabbers. Never could tell if it really made a deference, but in that kind of game/match, whatever makes you feel better is a good thing.
I only had the ones those folks sent me for a review in a magazine, never bought any.
Twas around the time I took Ayoob's LFI1 and he was all hot for using factory loads with standard bullets as much like the local LEOs as possible. Those teeth seemed like an invitation to draw unwanted attention if used for self defense.
Sometimes I wish Davis was still doing the Pin Matches I a big way. I think it pushed folks to be fast and accurate. Did tend to get very game gunny though.
Other round besides HS that was much thought of by the press was the Glaser Safety Slug. I played with those in .380, 9x19, and .45ACP, but they were too expensive to practice with.
Back on HS. For a bit I carried Federal HS .45 ACP as my defense load. It just got very expensive to practice with as well.
My favorite for .45ACP was the old Speer 200 grain "Flying Ashtray" HP. I once had to do a mercy shot on a White tail along the road after a close encounter of the Ford kind. She was struggling but obviously down for the count and with her moving so much I went for the chest. One boom and out went the lights. When I dragged her completely off the road, there atop the grass right next to the pavement was the Speer bullet, now with an oval frontal area of .75x .60 and a bit of rib laying there with it. I rolled her over for a look and you literally COULD put two fingers in the exit through that rib. Gave me plenty of confidence in that bullet and load of Unique.
-kBob