Yes, they must be high pressure with their advertised velocities. The only Parkers I use steel shot in have sleeved on, fluid steel barrels. One is a 12ga #2 fame VH with skeet chokes; the other is a 10ga #3 frame NH with tight chokes, but here I shoot 12ga shells through 3&1/2" Guage Mate inserts. I have shot 12ga bismuth in my Trojan and my GH with Special Steel barrels. I have not used anything but lead in a damascus or twist barrel. I mentioned Black Cloud wads as I have recovered some and they are heavy plastic with no slits or "petals" in the cup, only in the base to open when leaving the muzzle.
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