Nice shooting Bill.
The Schulz & Larsen model 54 free rifle was primarily designed to fire a 6.5X55mm round at targets 300 meters down range accurately.
A few like this one were built to fire a 6.5X57mm round in Palma competition. It was built to be accurate at 800 to 1000 yards with iron sights. What's unique about this rifle is that the thumb hole stock is ambidextrous.
Note the set trigger, you push the front trigger forward, then fire the weapon with the rear trigger. I tried to measure the pull and my gauge is not accurate enough. My guess, 12 grams. It has a 26 inch barrel that is 1 inch in diameter and the overall weight is 16 pounds. It truly is a monster. Perhaps even bigger than the Mark X Dave is building now.