I just recieved my new Kimber Montana 300 WSM. I shot 15 rounds of Federal 165 Trophy Bonded tips over the weekend and could not get them to group very well. Should I switch to a Winchester round or try another Federal? I also think that it's possible that the groups will become tighter as the break in period progresses. Does anyone have any experience with the best factory ammo for my gun. I have 5.5x22x56 and was sighting in at 100yards in a lead sled. Any other tips would be appreciated. Thanks in advance!!!