Here are THE RULES for a RAMBO KILL:
1.Rambo must be the one who causes the death.
2.The death must be confirmed with video evidence.
3.Rambo must cause certain death, not just serious injury.
4.The death must occur in the movies, kills from video games or comics are not included.
The wiki says Rambo 3 has 115 kills. I mean assuming we're not including movies about nuclear war or something, I guess that would be pretty high. However the fourth film has 254 kills.
I watched a "body count" video for the fourth one and my main memory is people stepping on land mines and exploding like when people used to land on the big spike wheels in the pit in Mortal Kombat 3.