I agree that a floating barrel is usually preferable from a group size / zero shift perspective.
The barrel on the HW100 can be floated by removing the O-ring inside the support that secures the barrel. The big problem is that the stock to action fit on the '100 is a terrible design (two flat surfaces held by a single bolt into the block) and relies on the barrel/support interface to prevent the action rocking about the rib on its underside or rotating about the single stock bolt fitted to it.
I've floated the barrel on my HW100 by removing the O-ring; inside the support the barrel can easily be moved from one side to the other - failing to return to the central position when released as the movement is due to the action rotating with respect to the stock rather than the barrel simply bending..
Last edited by cloverleaf; 11th November 2014 at 03:04 PM.
Reason: To better reflect the points made in post 11 of this thread..