Go back and read what buckhorn cortez said, as well as others about needing to be rated for steel. It may help if you said what model gun you have and its year of manufacture.
Even if your barrel is a modified, it still has to be rated for steel shot. The fact that your barrels have fixed chokes suggests to me that they are older and are likely not to be rated for steel.
That you shot X number of rounds without noticeable damage does not mean you won't bulge a barrel with the next shot.
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