Steel does not compress like lead shot...as it goes into the choke area of the shotgun.....so I would never shoot a choke tighter than a "Modified" for Steel - regardless of the age of the gun / and I think you're risking damaging the barrel if you do.
In every Browning shotgun changeable screw in choke I've seen....the chokes marked as "Modified" chokes read...."Mod for Lead - and Full for Steel"....so shooting the Modified choke with a Steel load, gives you a "Full" choke pattern with steel / that's all you need.
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