.223, .243, .308, .270, .7mm 08 are probably the 5 most common calibres in NZ. Add in 30.06 as well all have good amounts of factory ammo. The new calibres like PRC, creedmoor might be new and exciting to some but ammo choice is much less and more expensive.
I have a 22.250 and a .308 both bought second hand and happy with both.
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