Hi mate, not so long ago i asked the same question and had a lot of help And advice from the guys on this forum anyway i eventually went for the .223, purely because of a greater variation in loads and bullet weights, factory round availability and of course ( being Welsh ) cost Don,t think Theres a lot of difference in these calibres as a fox round, but due to the fact you won,t be reloading, in my opinion .223 would be best option.Forgot to mention , i use a Howa 1500 series great bit of kit !!
LD