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Thanks! Some of them were very difficult, it took a couple of play throughs to find the lot. Honestly, they did take a long time to find- I've just been spending WAY too long on the PS3 since I broke up for Christmas! 
Just gotta complete the game on hard now and I can bag the platinum. Man, Boilz Booty is difficult! |
The list compiled by a certain someone as to where to hide the barrels can only be described as "fucking evil".
One of the suggestions put forth by this individual was a barrel hidden in such a way that you can't see it at all, you just have to shoot a boom bat over a wall at the right angle and if you're lucky you will hit it.