Open sight adjustment help needed from Chapuis double owners please

[Fabnosh]

Morning guys

I'm after a little help with adjusting the open sights on my .375 H&H Chapuis side by side.

I've just developed a new loading that regulates well but I'm finding that the point of impact and point of aim are not coincident. Point of impact is two inches to the right of the point of aim; elevation is about right. Distance is 50 yards. I've had a friend shoot a half dozen rounds and had the same error so it's not down to my technique - many things probably are but not this one lol.

The foresight blade has a grub screw locking it in place but this extends into a tapped hole in the blade mount base and gives the impression that this was drilled and tapped to hold the foresight blade in place and prevent any movement and free adjustment.

I can probably resolve the grub screw issue but could use some counsel on how best to resolve the degree of adjustment necessary to correct the poa/poi issue.

Thanks in advance

FN

 

[AZDAVE]

Since your elevation is correct, no adjustment is needed on the front sight. you will need to drift the rear sight to correct the POI to POA.

 

[crs]

On my doubles, I have that done by Aaron as it has required some filing on the rear sight.
He has one of my rifles now and one of the tasks on the list is regulation with a new load and that task includes the express sight, telescopic sight, and replacement of the scope mount with Talley QD that mounts on the rear rib (same as my .405 DR). Way beyond my capabilities.

 

[Woodcarver]

Brass punch. Light mallet. Drift rear sight carefully, to the left in your case. First step is to give yourself an index line on the rear sight and the dovetail so you know how much movement you have accomplished. Use a pencil, rubs off easily but is easy to see.

 

[Fabnosh]

Woodcarver - that is just what I was looking for. Many thanks.

FN