You can have the constriction opened up to modified making the gun much more useful but killing the resale value. Since you inherited it you may not ever want to sell it.
I would ask whoever reamed it out not to remark the barrel.
The best option is to use non steel non toxic loads that will not hurt the old girl.
I have an old A5 Full Choked I want to hunt with some but I have not tried the softer shot.