I have an old school Belgium A5 that I bought a new barrel for to shoot steel right when it was first coming out. I had mixed results with the invector chokes (modified or full) that I thought I needed to use at the time. However, when I dropped down to a plain improved cyliner choke, my issues went away and it became a killing machine. I've used it to cleanly kill geese at 60+ yds up on the SK prairies, so it definitely works for me. The IC choke was night and day better with steel than the others. I haven't tried one of the high $$ aftermarket chokes as I see no reason to mess with something that works.