I'd agree it is probably a bedding problem.
But it can also be a barrel problem, if it wasn't properly stress-relieved during manufacture.
As the barrel heats up, it warps!
You can rule that out by firing one shot, then waiting for the barrel to fully cool, firing another shot, and so on.
If it groups all of them in the same place then, you may have a problem with your hot barrel.
If it still throws one out of the group, it's most likely poor bedding allowing the barrel & action to move around in the stock.
Have you checked your action screws?
Have you checked your scope mount screws?
You could also try some forend pressure by shimming the front of the barrel channel with a cardboard shim until you have upward pressure on the barrel.
Contrary to popular openion anymore, not every accurate rifle
has to be free-floated!
rcmodel