Unless you were to use a military 98 action or take a commercial one out of a rifle the best option post WWII was the FN. Rigby, Westley Richards,Holland & Holland and all the top gunmakers used FNs.
Rigby even used FN 98 actions for their .416 Rigby. Economic conditions in Europe after the war were so dire that FN actions were very affordable and used by Colt, Sako, Weatherby, Winslow,Dumoulin, and even the JC Higgins mod.50 made for Sears had an FN Deluxe action. The finish, heat treatment, and steels used do not require the re-manufacturing and modifications required to bring military actions to the same specs. It was a sad necessity of war to put the German gun manufacturers out of commission. The 98 Mauser is not dead and commercial versions of top quality are being produced today and for decades to come.