Referring to the post about the 20 gauge Model 12, the chamber measurement in the barrel does not give an accurate measurement of the entire chamber. The entire chamber includes the ring that remains with the receiver when the barrel is removed. A 2 1/2" early 20 gauge Model 12 barrel chamber may measure just over 2" when a cheap chamber gauge is used. A normal plastic .410 wad should be suitable for 2" .410 loading when a good part of the petals are cut off. I use scissors for the task and don't pay too much attention to exact measurement of the cut. The remaining wad volume would be less than the normal .135 or .200 cardboard over powder wad.
