As quoted in an article authored by George Trulock and Jerrod Trulock (Trulock Choke)
Quote:
"...However, the fact that steel shot exerts much more stress on choke tubes has not changed. The problem is that steel shot is much harder than lead. It will transmit much more energy to the choke when it strikes the conical portion and if the tube is not of sufficient strength it will cause it to deform...
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And - he was referring to MODERN CHOKES IN MODERN GUNS - not vintage shotguns...
I'm guessing the Trulocks should know...