Bill and Fred,
I had feared that shooting 12 gauge steel in a 10 bore might result in shot slipping through the wad petals and scoring the bores. The nominal bore difference from 12 to 10 is .046". I measured a 10 and 12 gauge wads and found them to be .750" and .705". The shot cup will clearly expand to fill the bore in their respective gauges but an expansion of .070" will require something like a liner... "Lightbulb turns on!" How about one or two layers of Mylar liners? The scoring problem should be mitigated.
I also measured wad petal thickness:
Rem SP-10: .025"
BPI VP-100 10ga: .035"
BPI Multi Metal 10ga: .035" which have a much harder wad petal.
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