Re: stock warping away from barrel fix suggestions?
By the description you provide, I wouldn't be in the least bit concerned about 1/8 inch. The first thing I would do I check to make sure all of the screws holding the action in place are nice and tight. In likelihood, this is probably the way the gun was made.
The last thing I would do is try to glue the stock to the barrel. The pressure on the barrel from even the smallest bit of anything stuck between the wood and barrel will likely result in a change in the accuracy. If any part ever breaks off from the glue/wood, it would also likely keep you from being able to get any sort of decent groups. Another way to think about it is many people like to ensure that there rifles are free floated to minimize this. Any thing stuck in the barrel channel will negate any free floating of the barrel.