I'm thinking about looking at 243, 7x57 & 7-08. (unless someone has a better suggestion, and I'm sure a few will.

They are all popular rounds & as I reload all my ammo are the 6mm or 7mm projectiles or the cases significantly different in price?
Now I don't really need this rifle as I have a spare 3006. (the other is loaded with 180 gr projectiles for deer) I could load it up with 130 grain projectiles & it's already fitted with a 4x40 scope ( perhaps up grade the scope) that I figure would do the job OK.
What do you blokes think? What would you do? Use the 3006 or buy a rifle, if so what calibre?