The following is a copy/paste from a table I found on SGW.
Popular .410 bore wad (cup) dimensions:
Wad Total Height, Base Height, Base Diameter
CB1050-41A 1.455" (36.95mm) .149" (3.8mm) .384" (9.76mm)
CB5050-410HS 1.469" (37.33mm) .148" (3.77mm) .399" (10.14mm)
WAA41HS 1.478" (37.56mm) .186" (4.73mm) .402" (10.21mm)
Orange PC410 1.358" (34.5mm) .138" (3.52mm) .394" (10.01mm)
Rem. SP410 1.454" (36.95mm) .175" (4.44mm) .399" (10.14mm)
Yellow Duster 1.422" (36.12mm) .182" (4.64mm) .383" (9.73mm)
Total Height = Top edge of petals to bottom edge of base.
Base Height = Shot cup floor to bottom edge of base.
Base Diameter = At bottom edge of base.
Base width measurements were made at the base edge of the wad, and one petal was cut off so the base height could be measured from the true flat of the shot cup floor.
Couple additional points. The Rem .410 hull is only slightly larger in capacity vs the new AAHS .410s. There is no reason you cannot get the full 1/2 oz in a HS hull that will have a lifespan about 4 times that of the Remington, and at least twice that of the Federal.
Primers...... If you look at published loads you will see that what we consider "hot" primers in the 12 may not be so in the .410. The Fed 209A data is a prime example. I would not substitute primers based on my guesstimate about brissance.
