Are these steel core? — 2 Answers

If you want the penetrator rounds they are 62 grain not 55. PMC calls theirs M855 LAP ammo. All companies put them out as M855. But honestly you're better off using the 55 Grain FMJ that you questioned. None of the 62 grain are true penetrator rounds civilians can't get the true rounds they're strictly for military use. they have a lead core but they won't be what you're expecting. at best, just buy 1 box and try them before commiting cause your barrel may not like them. I didn't and they ended up having the widest 100 yard MOA of anything else I shot. the rifle I bought them to use with hated the rounds. after more research more people recommended these instead and said they were more accurate. Hope this helps.