What is the most important factor in choosing ammunition for hunting?

When choosing ammunition for hunting, the most crucial factor is compatibility with both the firearm and the specific game being hunted. While the price and weight of the ammunition may be important considerations, using the wrong type of ammunition can lead to ineffective or even dangerous hunting. Similarly, the brand of ammunition does not necessarily dictate its compatibility with a specific firearm or game. The effectiveness and safety of the hunt should always be prioritized over cost or weight.