I have been casting for awhile and powder coating for about a year and a half. I started out with the hf red with okay results and when that ran out went to the hf matte black. That is turning out to be a huge mistake. The threads that I read about it being abrasive seem to be painfully true. The rifling in the first half inch of a 5 inch xd barrel is GONE. I don't have an exact count, but probably around 3000 rounds in the last few months. I closely inspected the barrel on my 2011 and didn't see any obvious damage but the wife's xd barrel is done. For those of you that have been using it with good results, be careful. I for one am done with it.