All you mentioned was deer, so we'll go with that, and the '06 is off the table.
The .300 is the easy one to cut.
I'd be inclined to keep the Sako, because it's a Sako and likely a bit nicer than the Tikka more than because of the cartridge. I personally don't care for mags that hang down. You may just want to keep the one that fits you best, and you should keep a spare at least because stuff happens. If you don't really like either all that much, sell all three and buy something you really like, maybe in a very light version like a Fieldcraft. I'm trending towards light and handy myself and have picked up two .24 calibers that weigh around 7lbs or a bit less, and like the concept a lot after a couple seasons.
