Ok, this pic is of some typical WWII-era stock discs. There are 2 different versions in the pic. At about 10 o'clock on the right hand disc, you can see a small triangular stamp over the 2, this signifies a 6.52mm bore diameter. This disc was used thru at least 2 inspections, it is also stamped over the 1 on the inner line, signifying a 6.51mm bore diameter. The highest number stamped is always the one from the last inspection.
At about 2 o'clock is the barrel grade section, this disc is stamped with a 2 and a 3. If this section is unmarked, it signifies a new, unfired barrel. If it is fired at all, it becomes a No.1. With more use, it becomes a 2, and finally, a 3. When a weapon came into the arsenal with a #3 barrel, it was replaced.
The bottom section was hardly ever used, it was supposed to be used to indicate the amount of holdunder to be used when using M41 ammo, but the rangeplates were much easier to use. If you do have a number stamped here, it is usually a 0, and it indicates that the sights have been changed to hit with M41 ammo.
On the left hand disc, in the barrel diameter section, the inner line of numbers (9,0,1) indicate 6.49mm, 6.50mm, and 6.51mm, while the outer line picks up from there and runs from 6.52mm thru 6.55mm. On the later style disc on the right, the inner line runs from 6.46mm dia. thru 6.50mm dia., while the outer line runs from 6.51mm thru 6.59mm.
Reading the rangeplate
This rangeplate is for an M96 rifle with the standard sights. there are at least 5 variations of this plate, for different weapon/sight configurations. The top line on the plate tells you which model it is for, G m96 means Gevar (rifle) M96. The next line, sikte for trubbkula, means sighted for roundnose (160 gr. M94 ammo), these are the standard M96 sights. The next line "Skjutning med spetskula" means "shooting with spitzer" or 140 gr, M41 ammo. You can also find these plates with these 2 lines reversed, sighted for spitzer, and shooting with roundnose. On the next line, Avstand means range, and sikte/rp means sight setting. The Swedes use something similar to our minute of angle called a streck. This works out to one decimeter at 100 meters, or 3.94 inches. The sight settings on this plate are in decimeters. The first line, for a range of 50 meters, you would use the 300 meter setting (the lowest setting) and aim 2 decimeters low, or 7.88 inches. For all practical purposes, I use a figure of 4 inches for a decimeter. For another example, the next to the last line, with a range of 550 meters, you use the 400 meter setting, but aim 3 decimeters high, or 12 inches.
These plates are mounted on the stock "upside down", so that when the rifle is at your shoulder, you can just roll the rifle slightly and read the plate without dismounting the rifle. Many of the Swede Mausers sold are missing these plates, and a lot of new buyers freak when they are shooting at 100 yards and hitting a foot high. They do not realize the difference between the 2 types of ammo, and how different the trajectory is. These plates were later replaced by decals, but they scrape off pretty easily and become unreadable fairly quickly, so I have always preferred the plates. Most of these were made of brass, but you will also occasionally run into aluminum ones.