Jeff, I remember your post where you said Turnbull indicated the chamber wall was thin, I don't recall whether it was them that said something about chamber sleeves, but what was their thought process? Sleeving the chambers to .410? That would be ill thought out, as the .410 charge, wad and shot, would never fill the 28ga bores to build any sort of adequate pressure. it woudn't be of any use beyond 15-20 yards. Sleeving them with same bore sleeves wouldn't yield any increase in the wall section either.
Unless someone lengthened the chambers to 2/75" or 3", I can't see how the chamber wall was any less than when the gun was made.
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