If you haven't already purchased the Brownells vise you might take a look at the vise "wallycooper" has on ebay. It comes with a few different (5 I think) aluminum bushings.
I got one to remove my factory 700p barrel and it worked like a charm. I DID take a dremel to one of the bushings until it fit nearly perfect up close to the action before trying to break the action loose.
I did the same thing to another bushing to fit my new mtu-ish contour when installing it.
I don't think that answers your question in any way whatsoever but that's all I've got.
