I have the 5.45 and haven't experienced it but my brother has 2 Polish Tantals and they are crazy with it. His targets look alot like yours at 25 and 50 yards. I read an article a while back while researching the problem for him that it was the barrels that were made for the century tantal parts kits that caused it, somethintg to do with it not being chrome lined and then the twist rate. If I run across the article I will post a link. If you have time google it (tantal keyhole). It may turn up some more info.... Irregardless, I'm not sure what might make it yaw in the AR platform. Maybe the fire pig you got. I go with the FSC556 and no problems, don't attack....I am just speaking out of my left cheek to any possiblities. Good Luck

