I do hope this "testing" method is in jest. It may shoot that time but what happens when it lets go in your hand and near other people.
Proof testing is best left to the proof house. Have a local smith with a understanding of double guns go over it and include wall thickness in the process.
Low pressure ammo is a must if it is declared safe. If it is not in proof hang it on a wall.
I shoot older damacus every day- but they are in proof and I shoot proper loads. With that they will play for many more years with proper care.
al
