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The short answer is.... If you don't know the velocity you cannot compute drop.
another thing it will tell you is if that occational flyer was you or the load.
It will also help you determine if your loads are too hot.
If the only thing your doing is finding a good hunting load for your 30-06 and all your shots are 100 yards or less. you don't need a chronograph. If your using a varmint rifle on whistle dogs in excess of 400 yards you want a chronograph.
A local guy's longest goundhog kill is 1076 yards, do you think he chronographed those rounds before going afield?
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