This thread reminded me that I have a couple of action sleeves tucked away, from many years ago when they were still popular. One for a Remington 600 and the other for a long 700. Have a long M700 receiver with poor finish, and a magnum face bolt needing a new handle. Could be used to make up a long range rifle. The 600 sleeve would have been used for a light varmint benchrest rifle.
One of my target rifles is a Hart built light varmint in 6x47. It is made up on a sleeved short Remington.