Fred at SSS sells a wrench for removing these barrel nuts. It's basically a compression wrench (left side in image) as once you slide it down over the nut, you tighten up a spanner screw to clamp it to the nut. The other end of the wrench (right side of image) is setup for removing the earlier smooth nuts that had a hole in the bottom to accept a pin (pin hole would always be on the bottom side of the barreled action).
[img width=600 height=179]http://www.sharpshootersupply.com/images/Accessories/smbnw.jpg[/img]
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