The price on those reasonable?
The initial cost would be about the same as a bolt action .308
Check out the ballistics between the 300 win mag and .308 to see which would suit you best.
The .308 has almost no recoil compared to the 300 win mag. So if you are recoil sensitive you might think about a heavy barrel and a recoil pad. Or just sticking with the .308
I have a .308 savage with a heavy barrel and it is by far my most accurate rifle at 100yds. I have a 300 win mag remington 700 with a heavy barrel that I use for hunting. The ballistics are better and it bucks the wind better too because of the heavier bullet weight.
My hunting buddy has a tikka lightweight 300 wsm that weighs half of what my 300 win mag does but he can't shoot it accurately because of all the recoil. Something to think about depending on what you will use it for.