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Ammo manufacturers readily share the bullet weight in grains in their advertising, but rarely give details about what type of powder is being used and the powder weight in grains. Different ammo manufacturers use different types of powder and different powder charges. Although ammo with a heavier bullet weight will tend to have a hotter powder load (more powder or faster burning) this is not always necessarily true.Remember, you can achieve a more powerful powder load by using a faster burning powder, or increasing the amount of powder in the load. Using near or at the maximum powder load that is safe to fire in a gun is called "loading hot." Hot loads are more powerful, which causes more recoil (kick) and the bullet will strike with more energy. However, ammunition hot will shorten the life of your firearm in increase your risk of injury.