Winchester 70 based high power match rifles in 308 Win clamped in return to battery machine rests have tested 10 shot groups under an inch at 600 yards. One 40 shot group went into 1.92" at 600.The bench rest is the ultimate support for a rifle system and is a precision mounting for the barreled action that "Will return to the exact same location every time it is fired" if it a good system.
Here's the machine rest with a tube gun:
https://www.flickr.com/photos/12787226@N00/albums/72157594303093714/
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