Almost every bow on the market right now would be a hard cam bow. Unless you own a target bow with round wheels or a youth bow with a lower effeciency.

I would say with any hunting bow use the hard cam option. You are better off with arrows on the stiff side than you are with arrows that are not stiff enough.

And most of the online charts or calculators blow anyway. They simply just don't ask for enough information in my opinion.

Paul