I see a few problems, but nothing major or dangerous.
One is that that bullet is a little heavy for the 7.62x39 and will probably protrude into the powder space when loaded to fit the magazine. Try light loads to start, then work up. The accuracy will problably be fine for informal shooting.
A second concern if you are going to shoot those bullets a lot is that that bullet has a heavier jacket and is made to upset in the bore with a cartridge running more pressure, so it might not expand to fill the grooves of the slightly larger barrel. See if you can find some fired bullets and look for good groove engagement; bullets that don't upset to fill the grooves allow gas blowby and resultant erosion, but that takes a lot of shooting.