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how many grains per inch should you have for a hunting arrow? i'm are 8.2 at 31inch and i'm shooting 60lbs. is this ok?[/align]

Personally I think you are fine with that set up. Some will use a heavier for a little more KE, but it's your preference.

I like over 10gr/in. And skinny arrows. Thats the reason I like carbon express CX edge and beman black max.

8.2 will work just fine for whitetail.

Most bow manufacturers will recommend or warranty no less than so many grains per pound of draw weight. For instance, my Switchback is no less than 5 grains per pound. I'm drawing 70lbs, so my total arrow weight should be no less than 350 grains.

Figure out the weight of your nock, vanes, bh or field pts, and insert and subtract that number from the recommended total arrow weight and you will have the minimum bare arrow weight. Divide the recommended min bare arrow weight by the length and you will have the recommended min. grains per inch. This will obviously give you the most speed w/o potentially damaging your bow, but it may not give you the most kinetic energy.
hope that helps

I failed to mention that this may not necessarily give you the FOC you may want.

You should be good as far as weight but check your FOC. I like a FOC of 12% to 15% for broadheads

Grains per inch are completely meaningless. If someone, could make an arrow that was 3 grains per inch capable of shooting a tip with 450 grains on the tip, I'd shoot it. FOC and penetration would be incredible. As far as grains per pound of draw weight, I personally wouldn't touch anything less than 7 gr/lb. I prefer to be around 10 gr/lb, although I think if you can obtain a high FOC with less, you'd have a good hunting arrow.