Al- no, haven't tried the perferated wads. I have used hollowed fibre wads to improve patterns with cylinder bores, mostly muzzleloaders. I thought about the plastic wad base idea on picking one up at the R&G club trap range one day, and the thought hit me that if inverted, the cup would hold an undersized ball in the middle of the bore, allowing accurate shooting from any choked or unchoked gun. After taht, I procurred a double gun, chopped the tubes, installed sigths and went to work on the idea with success almost immediately. All it took was a bit of fiddling with loads and I matched the 7 dram BP 'heavy' 12 bore load listed in WW Greener's book. I did not enjoy shooting the actual 7 dram Black powder loads, though. Smokeless duplications kick about 1/2 to 1/3 as much and are just fine. As long as the velocity was 1,500fps or a bit more, the tubes regulated very well. 4" at 50 yards and 10" at 100. Sights make a big difference.
; A friend of mine, uses pillow ticking for patching undersized .684" balls in his duck gun and gets 5" at 50 yards with just the double bead in a 'figure 8' pattern.
: OxYoke sells or used to sell wool/felt wads - but at $8.00 per hundred and thousands of spent shotwads free for picking up, I stuck with the plastic wads.