The lack of full power factory ammo was the major factor.
I spent a lot of time considering the .243. In the end I was convinced by Nathan Foster's observations that there are no prizes for knocking down an animal with the smallest bullet. Particularly as a beginner, I will be grateful for the greater leeway afforded by the larger calibre.
As for the other calibres, the near ubiquity of the .308 is most of the reason that it feels like a good calibre for a new hunter.
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