Large bear traps are the most under used thing in the game. Get like 7 or 8 of the large variety and when you see a carno put one down between you and it, agro it, shoot transfer and rinse and repeat till he's down.
A Very under rated tame. High lvl Carno with a decent rider is capable of huge destruction. My Carno Hugo can take 3 theri and multiple troodons at once and not even bat an eye. Hes even took low lvl rex. A must have early game and even mid/end game is still a reliable mount.
When I first encountered a carno I had a lucky escape.it attacked from behind and sent me flying and I did not know what hit me but I ran until I fell of a cliff the carno followed and got stuck so get them stuck.
When you encounter a wild Carnotaurus in or near a forest, walk towards him, so that he is between you and the trees. He will go away from you to attack you with his charge run attack. By doing so he has a high chance of getting stuck between the trees. Now you can knock him out savely. But remember to chop down the trees when he is knocked out, because when he is tamed he will start running and bugging when the trees are still there.
Carnos are excellent mounts and hunting and battle companions. At mid-level, my pack of five have speed slightly superior to a raptor and strength comparable to a low level Rex. Focus on building melee, speed and stamina. Combine them with a couple raptors, a Rex and a Trike and there will be very little you can't overcome.
I'm taming one right now actually they are very easy to tame even at lv 50 just use a platform higher than they and you should be good lol I use my neighbors boat XD it takes along time to tame but worth it you need meat to tame at least or get special items for after tame
The Redwoods on the Center is the best place to find high level Carnos. Most of them are in the upper 90s, with the exception of a few level 45s.
Carlos are really great all around if you can get past their horrendous stamina recovery
I have a 168 Carno that's a literal beast, it goes against practically everything I throw against it, kills Low level Brontos EASILY, and that's with a mere 150% Attack, I use it as an overall mount that is helpful as a guard dog. Take one and have fun! :)