To kill grizzly and coastal brown bears reasonably quickly when shooting head-on into their thoracic cavities, what penetration in inches or a metric length is required to avoid running into serious "issues"? Does this depth of penetration remain constant for bow hunters' arrows? If firearms and arrows can do the job mentioned but require different penetration depths, which requires more depth? Why?

Last edited by Naphtali; 08/30/19.

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