I haven't commented on this thread because I don't have one. I am one of the fine fit and finish types,just so you know. I had a SW M617 start doing that due to the junk Fed 555 I was shooting. They leaded the first inch of barrel to the point a cleaning rod would not pass. That stopped when I lubed each one before loading, did I mention I am frugal. That is a possibility with these, build up leading, then "pass" it like a kidney stone and do better a while. The shot loads could be leading as well, don't know as I have not used the figure ones in decades. My real suspicion is that the timing and lockup are no better than the overall build quality and the generously dimensioned throat and forcing cone are their "fix". If so the bullets will strike the rifling at random angles and exit the barrel the same way. The base will Not be square to the crown and it will shoot like the crown is bad, really bad! When the high pressure gasses exit one side first, it tips the bullet leading to the keyholes in extreme cases. Could explain the shorts and colibri shooting better, less muzzle pressure to act on the bullet. I also suspect their "target market" is quite satisfied with a gun that goes bang every time. I am not throwing stones, they design and build to their market and that drives a price point. Just wanted to offer some thoughts on what could be causing the keyholes.