Those ole N frames are pretty stout . If using " Current " load data in 357 , is probably safe . The current data is not the same as " yesteryear " , much milder . Those 38-44 loads of days past were some pretty stout loads . The very early 357 magnum loads were really stout and they had to use 38spl brass as the 357 brass hadn't been developed yet. I think you'll probably wear out before the gun does . Just stay away from the hot loads using the lighter weight bullets - 125gr or less .