RE: .243 or .308??
If I were to pick a deer cartridge from the two then I would go with the 308 Win. I love the 243 Win but the 308 is just better on deer and can be used on larger game as well. However, I would have to think long and hard about the 7mm-08 Rem and the 260 Rem. Both are probably better as strictly deer cartridges and both are fully capable of taking anything the 308 Win can. Just something to think about.