In general, you can shoot steel in a choke up to a Modified ( but no tighter ) ...
as I recall - this is the gun you paid about $ 350 bucks for ... so in general, yes, you should be able to shoot steel in it, if you want. Is it likely to cause a "slight bulge" - not in my experience .... and will it blow up a barrel ( almost no chance ...) ... in my opinion.
If you're really worried about it / take it to a competent gunsmith in your area.