The recipes I am hand loading use the mylar wrap in 12 gauge and a 28 gauge wad top portion inside the 20 gauge wad. Both call for buffer. I find the buffer to be more as a filler than as a cushion for the shot or the barrel. The number 9 shot or even 7 is so small there is no concern with bridging as with big steel shot, and I have shot these hand loaded TSS in Parkers, Foxes, and Browning A5s, and I have no concern about the bores. The shot charge is so small because the shot is so heavy that it does not fill the shot cups. Plus it is not as if I am shooting two boxes every time I go, and the way turkey season is going the test shots may have been all that I will shoot.
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