Had three shots out my Ruger N01 Hubel 585 yesterday ,first shot was okay, felt the next two though !! reminds me of shooting a Martini 12 guage when i was about 15 and having a about 20 shots out of that damn thing .Will try and develop some lighter plinking loads for it .There was at least one Ruger here rebarreled to 600 NE [not 600/577 djd ]evidently the action needed a few mods to take it [so the gunsmith told me ],but is possible .