'Steel safe'.
In theory the potential exists for scoring the barrels or bulging the chokes with steel shot in a gun from the pre-steel shot era.
As Bill does in his 10ga, I shoot steel in my 12ga Stoeger/Sarasqueta. The price is right for the guns and the shells are as 'cheap' as you are going to find in non-tox.
Again, as Bill mentioned, if damage does occur, there are solutions. The only thing you might want to consider is opening the chokes. This will limit any potential damage to the choke section of the barrels and the gun will probably pattern steel shot better with more open chokes. Those AyA's and other Spanish 10's of the era are known for really tight chokes.
