Building an automobile is far different from building a set of barrels. If YOu won't buy that shotgun and drop in a modern 3 1/2 inch shell into the chamber and shoot it why would you want anyone else too?
But, if you feel safe, have at it, its your eyes.
Information is useful. Much better it is available than keeping it 'secret' based on some fear of what someone might do with it.
I have a W&C Scott Premier hammergun chambered in 2 7/8" 10 ga. It is a two barrel set, original damascus barrels and a second barrel set in fluid steel made by HA Lindner.
I was able to research previous owners and even contact people who had known a long term prior owner in Kentucky. (Where I found it.) Reported that he used the shotgun for years with 3 1/2" mags (Yikes) in the unaltered original chambers. (I checked, the Mags will chamber and the gun will close.) Not known which barrel set he used....
I am NOT about to try this.... Yet the information is useful in a general way to understand how tough these old guns can be.