Yeah, the flat bottom maybe but, the bolt looks almost identical, bolt nose, lugs & extractor. Very similar anyways.I’d say the Howa has more in common with Win70 than any Rem700 footprinted action.
I'm aware of the reputation the impact has &, I thought I'd throw that little bait in about it running near on as good as the Howa, just to see who'd bite. In seriousness though, I'd love an action which runs as good as the impact with BR cartridges.