Well, OTOH, if the human element is that unreliable, what the rifle might do without a human is pretty irrelevant, also. If you just want to machine rest something for some testing, knock yourself out, but the point is that POA vs POI shifts will occur between the two, and the vice/machine rest will seldom make it off the bench, to go shoot a rifle. Therefore, it’s a step most can (and likely should) skip out on for a hunting rifle. I’m not even aware of any competitive shooting that allows a vice. I get ‘testing’ on guns, especially for others, but a good bench rest and bags has almost all the capabilities and few of the drawbacks.