Use the traditional employed by Webley's them self's . French polish . Apply several coats flatting down with 400 wet or dry paper in between using thinned linseed oil as a medium this will give a nice "gunge" that will fill the grain prior oiling and buffing . Wire wool is OK but it dose tend to lift any fill out of the grain , I only use it to flat down between coats when using a "tru oil" type finish .