A 308 can do everything a 243 can only better, you can't say the same for a 243.....
Not ragging on 243 at all its a good cartridge used within its limits, but if you find a 308 a bit stout while your learning you can drop down to lighter projectiles or lighter charges and still get 243 or better performance, you can only stoke a 243 so far and it will still not be as good as a 308 if your stretching it's legs especially.
My 2 cents
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