Constitution Arms have published a high speed video showing their Tri-Cor .38 Special round being fired in gel. The Tri-Cor is loaded with three separate bullets stacked on top of each other, with a total weight of 158 grain. The individual projectiles separate in flight.
The Tri-Cor is very expensive. Constitution Arms are selling them in clamshell packaging containing six rounds for $29 + tax + shipping. This makes practice at the range very expensive.