Steel shot shells have come a long ways since they were first mandated. With that said, I could not recommend using steel in a Model 32. I say this based on the same reasons steel is not recommended in any other vintage shotgun.

With the Model 3200, I would say it comes down to overall condition of the gun. I think with open chokes and smaller shot sizes, you should be okay provided it is not a steady diet.

But I tend to agree with an earlier post. Why take the chance? As steel shot shells have improved, Bismuth shells are much cheaper than when they first appeared. As the guns age they weaken, both steel and wood. Ribs loosen, and wood dries. I'm a big fan of RST shells. 2 1/2 and 2 3/4" will still kill ducks and it only takes one pellet to kill a Woodcock.

Just my opinion like others, based on personal experiences.