Again, a 410 is typically not scaled down in terms of strength to contain pressure. For example, a tube with 1/2" o.d. (approx a 410 barrel) and .030 wall would be capable of containing higher pressures than a 3/4" o.d. (approx a 12ga barrel) 030 tube.
What you find in 410 guns is that manufacturing limitations and practical durability of the barrels drive the wallthickness that is on most guns. Otherwise making the 410s with walls only thick enough to contain the pressures would result in barrels so thin they'd be very difficult to manufacture and susceptable to damage easily. So, most 410s have barrels much thicker than needed for pressure containment.
