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Now are you talking about a steel core or a bimetal jacket?
The misconception is due to your post. I said nothing about bimetal jackets. Of course that exists and is shot frequently.. However you'd be hard pressed to see a fella bump fire true steel core 7.62x39 or 5.45x39 anymore. Not that it doesn't occurs but Ill put money on the fact that other than 54r most guys don't waste steel core ammo thus resulting in a true fire.
Anything can make a "spark". I see it often when shooting steel, but Ive never been able to start a fire, even when we tried.
However there are thousands of variables.. Im not saying it isnt possible its just not likely due to "steel core" ammo.
Not all 5.45X39 is steel core or bimetal jacket. I own some right now that has neither.