what is the benefit of a fluted barrel
Fluting (firearms) The main purpose of fluting is to reduce weight, and to a lesser extent increase rigidity for a given total weight or increase surface area to make the barrels less susceptible for overheating for a given total weight. However, for a given diameter, while a fluted barrel may cool more quickly, a non-fluted barrel will be stiffer and be able to absorb a larger amount of total heat at the price of additional total weight.[1][2][3][4]
Musket In the late 19th century, the rifle took another major step forward with the introduction of breech-loading rifles. These rifles also used brass cartridges. The brass cartridge had been introduced earlier; however, it was not widely adopted for various reasons. In the U.S. Army, generals thought their soldiers would waste ammunition, so they kept muzzle-loading black powder rifles until after the American Civil War. The introduction of breech loaders meant that the rifling of a weapon was no longer damaged when it was loaded, and reloading was a much faster process. Shortly afterwards, magazine loading rifles were introduced, which further increased the weapons' rate of fire. From this period (c. 1870) on, the musket was obsolete in modern warfare.[3]