I travel back and fourth to Colorado quite a bit and I really like the SKB ATA double rifle case and the SKB single rifle case. Their a little on the pricer side at $200 / $100 respectively but I've had no problems with them at all or with anything even moving slightly in the.
Thats a phenomenal price for the ATA and just so you know its huge. That will easily hold everything you want it to hold and will still have a decent amount of extra space!