Ive shot thousands of rounds of .223 through my Saiga 98% of which is steel cased and I've never ever had a failure of any kind in that weapon other then one issue of case head seperation using that reloaded ammo they sell at dicks.
I have had failue of winchester 12ga target loads from walmart (in several 12ga guns). and a few failures of .38 spl here and there in my model 37 (mostly remington).
Ive never had a failure from cheapo russian 9x18 with somewhere around 1500 rounds downrange.
Never had a failure to fire from 9x19 of any kind
never had any issues whatsoever with surplus 7.62x54r or any other centerfire rifle round
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