223 5.56 AR 15 Are these Incendiary Rounds? Regular Tulammo boxes filled with explosive rounds??

I am shooting AR500 steel with my Stag Arms AR-15 This is just regular ol Tulammo in normal packaging. NEVER seen sparks even with green tip M855s. Did they package “sparky boom flash rounds? ( don’t want to say the word but rhymes with *In Sindi Aeree*) in a regular box?? Bullets and cases are totally normal with no paint/ color etc. Anyone know what’s going on? Maybe just steel core were factory loaded by accident but no marks and I haven’t seen this with M855s It’s not even dark out just evening time yet the flashes are massive… What donyou think. I’m going to Test each Tulammo box to find which boxes do this and I’ll compare it to 5.56 Green tips amd upload the video