there is going to be no real difference in running costs between the 308, 7mm08, 260 and 243 if you are handloading. if your not handloading then they are not really suitable for that sort of range anyway
if you have a 1:10 twist barrel on your 243 try the targex bullets, 95gr they have a good BC and by the accounts Iv seen they perform well.
its what im currently working with to avoid the rebarrel suituation, run the numbers thru a ballistic calculator and weigh it up, then you can at least wear the barrel out that you have before spending the 700 odd that it may end up costing
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