As it was explained, these TSS loads have two protective shot cups so I wouldn't worry about scoring the bores. My only concern is that there would be enough thickness in the walls of the double shot cups to cushion the the effects of the non-compressible tungsten as it passes through the chokes.
Nevertheless, I might not hunt at all if I couldn't use a Parker - with apologies to all makers of modern shotguns... 
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"I'm a Setter man.
Not because I think they're better than the other breeds,
but because I'm a romantic - stuck on tradition - and to me, a Setter just "belongs" in the grouse picture."
George King, "That's Ruff", 2010 - a timeless classic.
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