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Steel shot is contained in a wad until it exits the muzzle. The first place the wad/shot are constricted is at the forcing cone - not at the choke. Steel shot is loaded to the same chamber pressures as lead shot loads.
However - steel shot can apply higher radial loads to the barrel as it does not deform like lead shot. If the barrel can withstand the radial load (rated for steel shot) then it is safe to shoot steel shot in the barrel. If not, then you can bulge the barrel at either the forcing cone OR the choke.
Also, large shot (lead or steel - larger than #5 shot) creates higher radial loads. Magnum shells create higher radial loads.
If you don't know if the gun barrel is rated for steel shot or not, then either contact the manufacturer for advice on using steel shot; or as, previously suggested, use an alternative to steel shot.
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