hay mate have a look at ballistic studies.com it is an awesome place to start it has more info on just about every caliber made in one place
http://ballistic studies.com and will tell you every thing you need to know check out the knowledgebase on his site
good shit so do it and it will give you a good safe place start if you are not sureand he is a kiwi who is also a member of this forum community
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