A good way to knock one out is to lure one into near the entrance of a cave such as the one near the red obelisk. You stand inside the cave, the golem will stand at the entrance and try to throw boulders but they cant reach inside thus you're safe. You can simply time yourself at shooting 1-2 rockets after he tries throwing a boulder at you. It is very important to aim for the head or you will kill the golem. (It took us 43 rockets using primitive launchers found in drops to knock out a 112)
It's a bit silly that kibble tames it a lot better than rocks or sulfur because even in the dossier it says that it lives off of absorbing nearby rocks and minerals. So mabey they should make it so you have to feed them a rare mineral like obsidian what if they made it so you could tame one fast and with high effectiveness by giving one a few hundred or few thousand obsidian . or what if there kibble was made out of a combination of ores and minerals .