Aluminium expands at about 4 times the rate of steel. If you have a steel reciever on your gun and fit an aluminium scope to it, on a hot day the expansion of the scope will cause a slight bend or tension in the reciever. This isn't so bad in a centrefire due to the strength of the components but in a rimfire you can have some real problems. This is why so many of the older benchrest shooters stuck with their steel-tube scopes. The scope and action expanded at the same rate, therefore balancing out the tension in the action / reciever of their rifles.
The same would apply to aluminium and wood. Wood is fairly temprature stable and Aluminium is not. Add to this that wood is moisture sensitive and Aluminium is not and you have a real problem.
Can you free-float the barrel band so it can slide independantly of the wood?
Dennis.
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