Yes i know that :) . they are very easy to recalibrate all you have to do is remove one of the 2 screw's on the top of the elevation nob and loosin the other, then turning the dial with numbers to where you want it to zero
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If you have a rufurb mark then you wouldn't be able to miss it . They are usually on the side of the butt stock , the refurb mark on Mosins and SVT's are not small they are about half an inch wide.
Like i said mine doesn't have one. yours probably came from the same batch as mine they are from Molot Arms
If you handload RE#15 is the powder you want or second choice IMR 4350 .I have two buddies that have snipers that will cut 1/2 3 shot groups one with 174gr SMK/RE15 and Privi brass.The other with PRC 148gr ball. I get the first two in the same hole and the third round seems to be 1/2 low.But who cares with an 70 + year old gun! I need to ventilate a moose ,elk or deer this fall with one.
Actually the ballistics of the semi-auto SVT and the PU are slightly different so the elevation cam has a slightly different cam. You can adjust the elevation knob as you mention but it will not change the cam. It will only set the rifle for 100 meters, or whatever your zero range is. SVT scopes were used on PUs, and SVT tubed scopes continued to be used on new PU production. If the scope was originally calibrated for the SVT, a cam was installed and marked CB for the PU ballistics. In the real world, the difference in ballistics is small. That is especially true if you are not using WW2 era LB ammo. Current LB is slightly different and the bullet base is different.