What about black powder and cast projectiles?
They would not be very difficult for someone to make in NZ .
I am far from an expert but have read that BP and cast projectiles can be used in many cartridges as long as cases are well filled up.
I recently got a 45 cal Kentucky rifle and it's great fun to shoot.
Fouling in smaller calibres is an issue that running a patch through seems to deal with quite easily.
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