Grafs brass is a good choice in this caliber. Is headstamped Grafs. Neat.
Something I've noticed with this particular cartridge is the huge variations in the length of the chambers. Since it headspaces on the rim, the depth of the chamber is not quite so critical. As a result, you will typically see that your shoulders are blown forward quite a distance. Every Mosin Nagant I've owned has exhibited this, as did a PSL.
Of course, when you FL size these cases, the shoulders are set back again. I do not know how many times this cycle can repeat before problems arise, but if you have a little extra $$ laying around, go to CH Tool and Die and have a custom sizing die manufactured for your particular rifle. All they need is a phone call to let them know it is coming, and 3 fired cases from your rifle.
FWIW.