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You cant use LARGE steel in tight chokes. Lead has the ability to compress and deform when pushed through a tight choke, steel does not and may cause a pressure spike or bulge the barrels. This becomes a bigger problem as shot size increases. The general rule is nothing larger than #2s through a full choke. I had never used a full choke with steel untill this year. I patterned several loads with various chokes in my 20 ga and found no evidence of any problems shooting #2 s or #1's through a full choke (extended). Keep in mind the constiction of any given choke varies from one manufacturer to the next. In looking at various extended chokes I found as much as .01 variation in one particular choke with .005 being the normal "step" to the next choke. in other words one companies full was the next companies modified. Often a choke designated as for steel (marketing tool) is little more than a "lead" choke of lesser constriction.
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