Hello Bill,
All double rifles are regulated to group their bullets together at a specific range, usually at a distance under 100 yards. Assuming you are using the same load (Bullet weight and Powder Charge). Double rifles have barrels that diverge and once the bullets are past their regulated distance the left hand barrel will pattern further to the right as the range increases and the right barrel will shoot to the left. Irrespective of what the sights say.
I'd suggest you contact the manufacturer to ascertain the actual loading used and the regulated distance to get both barrels to shoot together.
Harry
Harry I'm sorry to say the quote above in bold is not true, it is a mistake most all people think is true! The reason is gun writers, and some very well known gunsmiths repeat this misinformation till almost everyone believes it to be true!
The barrels are soldered converging, so the rifle will shoot
SIDE BY SIDE to infinity with the regulating load.
If you take the barrels off any double rifle and ploace the underlugs in a padded vice with the barrels suported with the sights aligned on a target at the distance engraved on the rear sight! Then place an empty cartridge in each chamber with no primer, and look through the primer holes like a peep sight, you will see the
RIGHT barrel's line of sight will be pointing to a spot that
LOW, and
LEFT of where the sights are pointing. The
LEFT barrel's line of sight will be pointing to a place that is
LOW, and
RIGHT of where the sights are pointing.
The reason for this is a combination of
recoil muzzle flip, and the amount of flip is tied to
"BARREL TIME" (the time the bullet is traveling down the bore till it exits the muzzle). If the load is the proper regulating load the bullet will exit the muzzle when that barrel is pointing to a place just
on it's own side of the aiming point of the sights. If it is the
LEFT barrel it will print just
LEFT of the aiming point, and if it is the
RIGHT barrel it will print the target just
RIGHT of the aiming point of the sights. So if the rifle is regulated properly, and the load you are shooting is the proper load for that regulation
the rifle will shoot paralelle no matter the range! The range engraved on the rear sight does not indicate a point where the bullets corss, which they do not, it only indicates the proper elevation for that distance.
This regulation can be badly effected by fireing the rifle resting dirrectly on the sand bags. To find the regulation you need to fire the rifle with only your hands, face and shoulder touching the rifle! You can rest your forehand on the bags but the rifle must be allowed to recoil as if shooting off hand. NEVER EVER use a leadsled to shoot a double rifle! More later because I'm sure you will have something to say about this. One thing that may be wrong with the rifle being questioned here is PEDERSOLI regulated by JIG, and that doesn't work very well! If that is the case the rifle has it's barrels hard brazed, and no smith will re-regulate it, at least one that understands double rifles, Most don't!
