First Question when did you free float the barrel?
If it was shooting fine before you free floated it, then this will be you problem, you will have to either Stabilize the forend of the stock and bed the action or get it re-pressure point bedded by a good gunsmith.
Plastic stocks don't have enough strength in the forend to be free floated without some work that's why they are pressure point bedded in the factory. A simple check is to hit the bottom of the fore end with your palm and if you can hear it hitting the barrel you will be lucky to get it to group.
P.S I brought a REM700 cheap from TM because the original owner couldn't get it to shoot, he had tried to free float it and never cleaned the bore. After bedding and stabilizing the stock and giving it a good clean it was back to shooting like it should.
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