I never once said that the 243 was more powerful than a 308. I was merely pointing out that I would notcall the difference "much bigger" in terms of caliber. The 243 is commonly loaded with a 100 gr bullet, while the 308 is commonly loaded with a 150gr bullet. The308 bullet is 50% heavier than the 243,and you will get more ft-lbs of energy and better penetration.

Bottom line is this. You put either slug into the kill zone at reasonable ranges, and you will have a very dead deer.