@ Jehzsa
Hi
I only have experience carrying and target shooting the NGA rounds. They were marketed as 'Eliminator' when they first came out in South Africa but became 'Sentry' after being introduced in the US. The only Sentry wound I have ever seen was a gunshot knee and the main characteristic of that injury was that the orthopaedic surgeons could not extract the bullet despite being able to access the bearing surface with metallic forceps. The expanded rim of the bullet was firmly lodged in the tibia and that is where it stayed. Fortunately for the patient there is no lead in the bullet so he is not at risk from lead poisoning. I don't know the circumstances of the shooting.
I did an unscientific comparison of a few rounds in 9x19, firing into a stack of 150 cellulose sheets (blank X-ray films). I fired Cor-Bon, Silvertip, Black Talon, HydraShok, PMP FMJ and both versions of the Sentry (there is a 60gr and an 80gr version, the 60gr cartridge being loaded +P).
For sheer penetration of these tough X-ray sheets, the 60gr Sentry was the best. The next best rounds were the 80gr Sentry and the Silvertip. If I remember correctly the Silvertip was slightly better but I could be wrong. Overall the Sentry didn't penetrate these sheets by an amazingly greater amount than the other rounds, but it was certainly the best by a noticeable amount, say 20 or 25 sheets better. Note that what gets sent to the US may well not be the same as what I used for these tests in SA. I emailed NGA about the specs of the Eliminator/Sentry and this is what they told me:
We have done away with the term Eliminator as it was not "user friendly" especially for the American market. We refer to it now worldwide as the Sentry projectile. Technically we call it a FWCE (full wad cutter expanding) a term which is patented to our company. I think we are unique in the world to have this design.
The colour of the cap is immaterial. In we have an 80 grain for 9mm and a 60 grain used for 9mm and 9mm short. Due to availability we have used red and blue on different lots. Blue is the preferred colour for some of our oversees clients.
The metal composition has never changed, it is pure soft (annealed copper)with a flash of nickel over it for lubricating purpose (nickel is a very smooth metal and does not leave deposits in the barrel) and cosmetic reasons.
The fixing method for the cap on the bullet changed some 4 years ago. Version 1 was welded onto the metal with an ultrasonic welding process. If the cap came off, it could not be put back on by the user. Version 2 has a press fit mount. If the cap would come off, it can be snapped on again by the users. The cap may occationally comes off if the user presses the bullet too hard on the front lip of the magazine. We have never experienced this problem but it was reported to us by some security companies who empty and fill their magazines 3 times per day (shift change).
The composition of the plastic was also changed with Version 2. The cap will now desintegrate 30cm after the muzzle in 95% of the shots whereas before a paper target at 5m would sometimes have a secondary hole from the plastic cap.
I have taken a picture of the 60gr version for you:
