Please excuse me for my ignorance but since the Barnes TMZ bullet is in a sabot, how can it leave copper fouling? I have squeezed off quite a few Barnes rounds and have never found any copper fouling in my ML. All the bullets I have fired through my Omegahave been either all copper or copper jacketed. I have not removed any lead or copper from my bore. I thought that one of the purposes of a sabot (besides the "forgiveness" it offers for anot so perfect bore) it is to protect the bore for exactly that, lead or copper fouling. Does the bullet seperate from the sabot in the barrel before it exits?