I have the same Viper barrel vise and a Wheeler action wrench. I use some brass shims on the Viper to make sure nothing gets marred. And yeah...I have to put a cheater bar on the Wheeler and hold it in place while tightening the nut. If you wanted to leave the scope on I suppose you could put a padded bar through the action slots and hold it steady enough....but it's a risk.
I don't mind pulling a scope off to do work these days. Use some tape and mark the reference points where it was installed. Just part of the process....
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