http://www.bowsite.com/bowsite/features/practical_bowhunter/penetration/index.cfm

With a 430 grain arrow flying 275 fps I am at 72lbs and 3x the needed amount. I could lose 114 fps and still kill. This is tempting me to turn the bow down a bit.

How much KE do you have?
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It's not what you got, it's what you give-Tesla

Don't go ridin' on that long black train ;\)