The "one screw type" brass disk
The larger sector tells the actual calibre of the bore.
A triangular mark is made above the "hundredth of a millimetre digit",
e.g. a triangle above "4" in the outer group of digits means 6,54 mm,
and a triangle above "9" in the inner group means 6,49 mm.
The second largest sector tells the difference between the point
of impact and the point you are aiming at -
when using the "new" pointed m/41 bullet.
"Torped" is a boat-tailed, pointed bullet.
"Överslag" is over.
"str" is an abbreviation for streck which is a unit for plane angles,
there are 6300 streck to a circle,
and 1 str makes approximately 0,1 m at 100 m.
So if it say "2" on the disk you will hit 0,4 m above the point you
are aiming at, at a shooting distance of 200 m,
that is - if you are using the Swedish Armys m/41 ammunition.
The smallest sector tells if there is any rust in the barrel.
A small triangle above "1" means visible signs of rust,
above "2" more rust,
above "3" rusty but still acceptable
Note that "3" does not mean poor condition, the Swedish Army never used
weapons in poor condition.
If there were more rust, or if the diameter of the bore
- at the muzzle end -
was bigger than 0,06 mm over the calibre stated on the brass disk,
or if the diameter of the bore was bigger than 6,56 mm,
the disk was removed and red sealing-wax was poured in the hole.
The rifle was then sold, or sent to an arsenal to be rebarreled
(during WW2 often into an m/96-38).
If the diameter of the bore was more then 0,03 mm,
but less than 0,06 mm, over the calibre stated on the brass disk,
the rifle was used only for training.
There are actually five grades, or classes, of deep seated rust,
or pitting corrosion in the barrel.
0 Absolutely no corrosion, abrasion or scratches
- As good as new.
1 One or just a few dark areas in the corners
between grooves and lands.
2 Rust in the corners between grooves and lands,
some spots of rust in the grooves.
3 Spots of rust throughout the whole length of the bore
but no sharp edges.
4 Sharp edges between corroded and not corroded areas
- Discarded.
