I concur about not shooting the older factory steel shot loads in Parkers, or any vintage barrel.
Some have anecdotally reported no ill effects with small steel shot in modern shot cup wads in open choke guns. Testing is in order.
Mark, I thought bridging was when large size shot formed to create a joined mass at the constriction, such as a transverse row of large shot becoming longer than the ID of the barrel. Bridging can occur with any shot material, however, the softer the material( like lead), the more it can compress when encountering the constriction. Are we saying the same thing?
Bridging is the problem when shooting buckshot.
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