Watch the video, then read on.
Playing devil’s advocate here, this isn’t a completely fair comparison, although the results were somewhat believably replicated. Fact of the matter is that similar results don’t necessarily imply similar performance in this case because the projectiles used here are radically different.
The Aguila sub-sonic round handily beats the RIP’s base by quite a bit weighing in at 60 grains, and more importantly, has a sectional density of .177, compared to the nominal 50-grain RIP base with a sectional density of just .570.
The Winchester fragmenting hollowpoint weighs in at 32 grains, where all eight trocar points together weigh about 45 grains at five to six grains each, almost half of the bullet’s 96 total grains of mass. That means that whatever the sectional density of the Winchester fragments is guaranteed to be significantly higher than the RIP fragments, although I won’t venture a guess for what they might be.
If you look at the total amount of energy being dumped into the block, the RIP bullet is coming in at 361 foot-pounds where the combined .22s make about 230 (he doesn’t post the sub-sonic velocity for his test, so for our purposes, we’ll assume the maximum rated velocity of 950 feet per second, which is generous), or literally half energy of the single 9mm bullet.
These results look similar in the gel but this can be attributed to bullet and fragment shape; the RIP is still dropping a whole lot more energy into the ballistic medium and penetrates similarly despite having a tremendously lower sectional density for the base and the fragments. This is not a clean comparison.
This isn’t an endorsement of RIP bullets, just the same. The testing must go on.
I will say that I completely agree with the the notion that the RIP projectile’s lack of expansion toward the end of the bullet’s path is bad.