throw off the pattern.
The final polish in the bore should be a mirror like finish, instead of the finish, we see in the bore of
almost all guns completed with the finishing tools and never lapped. You should lap the barrel with 800
or 900 carbide powder. A barrel highly finish will be known by the remarkable closeness of its pattern.
The only way to achieve this is with a lead lap. Along lead lap coated with fine carbide flower, and
paraffin oil as a lubricant. This process is also done in the lathe, or it can be done with an electric drill. If
used in the lathe, the lap should be held in the same holder as the reamer coolant tube, and is directly in
line with the bore.
DIFFERENT SIZES OF SHOTGUN REAMERS
You will also be able to add short extensions to a shotgun barrel to replace the damage end that has a
bulge or burst in it. There are a lot of choke adaptors made today that will mount to the finished reamed
barrel, and making and testing a choke is eliminated. This will cut many hours from making the finish
barrel, and I would recommend going this route.
BARRELS ON DOUBLE BARRELS
You will need to make quite a few different finishing reamers, as just about every barrel is different. Due
to the simplicity of making the reamers, you should be able to make several different sizes at a time.
You will need to make sizes starting from .008 over the sizes we recommended for the finish reamer,
and down to .O30 under the finish reamer, in .002 steps.
SOLDERING THE BARRELS TOGETHER
You will be able to install new barrels on old double-barrels, just about the same way. Cut off the old
barrels, first removing the ribs, in front of the hinge. Then you have to rebore the chamber ends to fit the
new barrels. In some cases this is the way they were assembled, and they can be heated and the old
barrels can be removed. Lot of the old shotguns was made this way at the factory.
Take the finish barrel and turn the chamber end to the size needed to just slip in the old chamber section
of the double barrel, or single shot. I might point out that the fit has to be very close, or you may get a
bulged chamber. You can use a good low melting point SILVER