Yep 243 will kill anything that we can shoot in the UK, no problem. As with any calibre, shot placement is everything and with the flat tradectory I find it my calibre of choice. I've shot Red, Fallow, Roe, Muntie, Foxes, Rabbits, Geese, Crows and even a Bull. At the farmers request I might add. Nothing wrong with the 243, it's down to the man who squeezes the trigger.
Yip agree put the bullet in correct place. Have dropped a cow on the spot with 243, again at farmers request. Once you get your rifle you become confident with it.