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when we did the compression test we found that most paint could flex somewhere in the neighborhood of .125" before it gave out. Obviously we're not talking anything like that sort of deformation in a barrel.
My guess, based on looking at underbores small enough that they cause breaks - is that the breaks are mostly seam failures. This may mean that the amount you can underbore is more related to the seam orientation than the total underbore level.
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