Finally got the rifle home.

The rifle has 28" barrels.
The chambers are 3".
Twist is 1:41.
Weight is 3,95kg or 8,70 ibs.

I have ordered a 430grain mold and a 380grain mold in .506"

I went shooting some 440grain grainers here yesterday which regulates perfect in my friends H&H .500 3" express but was "ok" in mine but left room for improvement.

As I read in the older gunbooks of the 1880s period the.500ex 3" was a 5drammer regulated for the 360grain express Hollowpoints. I think the twistratio also dictates a lighter weight bullet.

The funny thing on this gun that it says nothing on what caliber except for "39". When 3inch and 3 1/4" ammunition was available at that time they could atleast have helped the sportsman to inscribe the type of ammunition the gun was made for. H&H was just about always kind to put it on their guns.