Have any of yeah tried them? I have seen no more than 280krpm which limits me to ~2800fps. i may try to see if they will stay together running faster than that. I have had no time to deal with my 22x47L barrel. I only have some 105 hybrids, but I can order something else as long as it can get here by Wednesday. Were trying to line up to go chasing varmints next weekend, I haven't gotten to shoot varmints with the 6x47 yet, I see many people haven't had very good performance with the 105 hybrid on varmints.