Quick range session with Rem/IZH-18.
Winchester white box (I suspect it may be PRVI) and some brass-cased European surplus (mixed head stamps 1973 - 1991) shot fine during sight-in at 25 yds and doing some plinking. Surplus stuff had lighter primer indentations (harder primers?) but went bang every time. No extraction problems, but I can see where that extractor could be a problem if not fit right. It has a spring-loaded 'post' in the extractor that engages the extractor groove on the cartridge case.
So far so good. With fingers crossed, I tried some Wolf steel-cased ammo.
This cheap stuff is a definite no-go in my rifle. First shot = 'click.' On second strike it fired, but firing pin stuck in primer making action hard to open. Not having learned my lesson, I tried it again. Second shot = 'click.' Hmmm . . . may have a pattern developing here. Again on the second strike it fired, but the primer was pierced. End of shooting steel-cased Wolf ammo in my IZH!
I'll let you know how I make out with better optics and handloads.