Every year around this time people venture back into the mountains: to gather sheds, hunt for mushrooms, or just to give their lungs and legs a workout. Invariably, some cross paths with ornery bears.

The .45 ACP and 10mm Auto are two of the most popular large semi-auto pistol cartridges. In today’s market, fans of large-caliber pistols will eventually find themselves considering the 10mm vs .45 ...