You will find that it shoots about 10-15" high at 100 yards with the sights set a lowest set. Zero was 265 yards with a 320grain round nose bullet. I think I built my aux. sight about .250 higher than the original front sight.
The bullets I have are not available any longer as my source has passed away. I do know that cartridge OAL is critical if you wish to use the magazine, I can look that up for you as I have it written down in the load book. And I do have a drawing somewhere on this new computer of the original Swiss bullet, But it will be a beast to find ight now.
I do know that my load of Accurate 5744 does a great job, even with my sewer pipe bore( it is really bad) I can get 4" groups @ 100 yards.
Good luck with this project, you'll find the thing is accurate and a pussycat to shoot, about like a .410.
Rebel49