Try spraying some penetrant oil (Kroil, PB Blaster, etc) and let it soak for a few hours, a full day would be even better. Also it'd be good to use something on the wood blocks to help the barrel from rotating (rosin powder is best but in a pinch I've used brown sugar, it's is better than nothing). Make sure you clamp the blocks real tight on the vise. Applying some heat to the nut right before you put the wrench on it might help as well (be careful not to overheat it, the way I gauge it is I want it hot to the touch but not too hot that it would burn the skin).
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