The speed is great with a light arrow and accuracy and where you put that arrow are number one in my opinion. Because if you hit them in the sweet spot any arrow with a good cut on contact broad head will have a complete pass through and dispatch the largest of game quickly. But what happens when that animal moves a little or you have buck fever and don't quite place that arrow in the sweet spot? That is where shooting a heavier arrow might just help you and penetrate that shoulder enough to get to a lung.
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