I just got back from the range from shooting a Sako 75 300 wsm for the first time. About one out of every three rounds was hard to fully close the bolt and to open it after firing. With one bullet I could not even close the bolt. This was a mild load but I had one case neck split on new brass. I full length sized new brass so I am wondering if it is a problem with the rifle or the ammo. I am shooting 200 grain accubonds seated .020 off the lands using a 300 win mag magazine in a long action. I bought an after market mag so I could run the long bullets but that should not have any thing to do with the bolt closing.