Yes I read that one. Also read the experiments described by Gough Thomas with the ball of plasticine trapped between the barrels and action, and the varnish painted across the barrels and fences.
These experiments do not isolate the effect of radial expansion, axial contraction in the barrels, which might be a causative factor in the plasticine flattening out, the varnish breaking or the tape being snapped.
Explaining the situation by reference only to the action, while ingoring the barrels seems a tad unscientific. Especially when the barrels are of soft tensile steel and the action is chunky hardened and fairly stiff.
