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The reason sticky extraction is a revolver pressure sign is that steel is more elastic than brass. That means steel can return to shape from a larger amount of stretch than brass can. During firing, the steel chamber and brass case expand together, but if the pressure is high enough they will expand past the point the brass can fully return to shape.
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Don't you really mean that the yield or elastic modulus of steel is higher than brass?
Overall, your analysis is correct.