I don't own one but a buddy has a 350 legend upper on a Ruger lower with match trigger. One minute the gun touches holes and then after a few rounds it slings them all over the place. He said yesterday he cleaned it really well and first 3-4 shots all touched at 100yards and then started throwing them high right and left. He checked the scope for tightness and then it still threw them everywhere. Could be the ammo but he was shooting Hornady rounds off a lead sled.