This to keep in mind, it sometimes doesn't take much to change the way the gun reacts. I made sure that when I shot it, I held the forend in my left hand, with the back of my hand on the bench rest bag. No bag at the rear. I found it then shot identically as when shot offhand.

The 2 in the bullseye were with the load that was shooting different elevations, yet by holding appropriately, I was able to put right and left almost together.

Forsyth spoke of this as using "aiming dodges" to make a poor shooting double to appear to be properly regulated.

So much better when the barrels shoot together. I did some work on the nipples, and fences.

as received - long nipples, hammers not cupping the fences and ruddy stain and finish with too much bright metal.
I found cold blue to darken their shiny stuff, quite nicely.