I think those are molly coated not Poly. I ordered a batch and they gave me fits in two guns with leading. Actually had a few that were undersized too and would not even crimp....just fell right out of the case. They are also swaged. I think that's why I had so many that were undersized (50+/-)? Just handling the bullets and the coating gets on your hands.
Anyhow I Powder Coat my own Bullets with no Issues. I have also shot Bayou, S&S, and Missouri Bullets and they never gave me an issue with the Hi-Tek Bullets. I changed barrels in my 9mm and still had issues with Molly coated Bullets yet my 10mm was fine. I don't know why my Sar did not like them. YMMV