Yes, for best results you need to float the barrel but no need for a smith. You can simply remove the barrel and sand out the channel until you barrel does not touch. A good way to do this (from Fireman JG) if in a vice or you have a bipod you can "stand" on, is get a piece of Emory cloth (backed by a piece of cloth cut from an old t-shirt) then loosen the screws until you can slide the cloth under the barrel from the front and, in a sawing motion work it back to the first lug....tighten the screws a bit and continue, doing this until your screws are fully tightened and you can still move the Emory cloth. This gives you a perfect barrel to channel contour.
A simple 'quick fix' is to simply shim the barrel up off the lugs with pieces cut from an old credit card.
Do not trifle in the affairs of dragons, for thou art crunchy and taste good with ketchup.