I wrote to Pedersoli about what their sharps rifles are proofed at and they told me that they are proofed by Italian Law at the CIP (Sammi) Standard pressure for the 45-70. This pressure is 27,500 PSI and that is all they warrent their rifles for. For cartridges that have no CIP (Sammi) Standards Like the 45-120 they warrent them for 25,000 psi and only recommend black powder or black powder substitutes. As Armi Sport operates in Italy under the same laws as Pedersoli does I would anticipate that their rifles are proof tested at the same levels in the Italian Government run Proof house. This pressure is the same maximum pressure to which Ammo is loaded by factories in the US and Europe.
This is what Armi Sport states in the owners manual.
"All our guns are tested in the Armi Sport facility. To guarantee the gun is safe, it is sent to the National
Proof House of Gardone Val Trompia – BRESCIA – ITALY - for proof testing.
The Proof House tests the firearm with heavy loads then checks the barrel, chamber and headspace to
make certain the firearm is safe for use with standard factory ammunition.
The National Proof House will put their markings on the gun, according to the Italian law, certifying the
gun is qualified and can be sold."