I think that effective range would be ability to wound a human at least once with a full mag.
I very much doubt you will find that is its real effective range as a hunting weapon on big game or small game.
Keep an eye out on here for a cheap sporting rifle second hand,they come up all the time. If you intend actually shooting Game at 450y you owe it to the animal to use a rifle and calibre that will do the job humanly and that your skills are up to scratch also.
Any of the popular NZ hunting calibers 6mm and up are capable of humane killing at those ranges if you do your part well tho it is at the extreme end of range for some without specialised loading.
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