Im having a sort out! Im going to get a .223 as a designated fox rifle and was thinking of changing from .243 to either 6.5 x55 or 7mm-08? I shoot mainy fallow and thought this calibre, 120-140gr bullets would be ideal, have a slight edge over the .243? Is there much difference between the two, is one superior over the other? Factors to consider i guess would be ammo availability, bullet weights etc. All just thoughts at the moment!