I'm currently using a winchester .30/30 L/A for this and it's a fine bit of gear but very prone to rust, especially up north in the humid conditions. It's also not really suited to anything over about 150m. It's also not terribly pleasant to shoot in the prone position!

My current thoughts for an alternate calibre are either a 7mm-08 or a .270 or possibly a .308.
Now for the questions:
Does the .270 boot the hardest out of those calibres?
What is the accuracy like with the new ruger Laminate stainless rifles? (what it's like out of the older ones?)
What are my other options? Howa, savage, etc?
Thanks
Mick