.223 rounds have a lead core, yes. Every one of them I’ve ever shot or seen is fully jacketed. I’ve shot .223 through 1/4” steel plates at the range. Close range I confess. But a small round, jacketed, with a high velocity can penetrate steel. I guess it just depends on thickness etc etc.
You fail to consider physics.
.223 rounds have a lead core, yes. Every one of them I’ve ever shot or seen is fully jacketed. I’ve shot .223 through 1/4” steel plates at the range. Close range I confess. But a small round, jacketed, with a high velocity can penetrate steel. I guess it just depends on thickness etc etc.