[quote=flounder33;3798804]Laminated stocks are both stronger and more dimensionally stable. They will still "move" if subjected to extreme moisture swings.
I have always thought that one of the reasons to "float" a barrel is that the barrel itself expands when it heats up and could cause a change in poi because it creates some pressure at the end of the barrel.[/quote]

You are correct.... the heating barrel really isn't the problem... the heat that is transferred from the barrel to the wood is the cause of the problem. If the wood were were equal density all along the barrel channel the expansion of the wood would not be as big a problem because it would move the barrel equally along with the sights so things would be fine. As it is heating regular wood created more pressure against the barrel in some spots than other getting un-equal pressures on the barrel causing a real shift in POI.

With a full length glass bedded barrel, the barrel rides in the glass and the glass is heated uniformally. Plus the glass is much more heat resistant so it reacts much slower to heat or cold.

Todays point bedding systems even do a better jog of stabilizing the stock to the barrel and are even less affected by temperatures.

I doubt you would ever find a professional long range shooter with a floated barrel, with a floated barrel even the ambient temperature of the air can cause a shift in POI. Normally we as hunters do not even worry about that one...