How does excessive grease affect bullet performance in a firearm?

Excessive grease in a firearm can lead to an unpredictable trajectory of the bullet. When too much lubricant is applied, it can cause improper seating of the bullet in the cartridge case or create an inconsistent interface in the barrel. This can result in the bullet not being released correctly from the firearm, which can affect its path through the barrel and its eventual trajectory when fired. Additionally, an excess of grease can attract dirt and debris, further complicating performance and reliability, and leading to erratic shooting patterns.

While some grease is necessary for smooth operation, particularly in reducing friction and wear, it must be used within the appropriate limits. Proper maintenance ensures that the mechanism remains clean and operational without the disadvantages that arise from using excessive amounts of grease or lubricant.