The earliest musket with rifling in its bore was born in Germany at the beginning of15th century. But at that time, it was just a straight slot to make it easier to load bullets from the muzzle.
According to the literature, Italy had a gun with spiral bore as early as 1476. Spiral rifling can make the projectile fly stably in the air and improve the shooting accuracy and range. Rifling is rifled in English, transliteration is "Frye", so rifling gun is also called "rifle". /kloc-At the beginning of the 7th century, the Danish army took the lead in equipping and using rifles. However, due to the high production cost of the dual-track system, it is inconvenient to load ammunition from the muzzle, and the armies of many countries are reluctant to equip guns with spiral rifling.
Early guns were all loaded with guns. 1520, Gott, a blacksmith in Nuremberg, Germany, simplified the pre-assembly procedure, let the gas escape, made the bullet play a tight role in the gun bore, improved the loading speed, invented the linear rifling gun, and used the round shot put to throw the bullet. Because the English translation of the word "rifling" is "Frye", rifling guns are also called rifles. Up to now, the rifle with the name of Yuanbao and the production date of 16 16 is still kept in the museum. This rifle with rifling is much more accurate than musket.
/kloc-After the 6th century, the straight rifling was changed to spiral rifling, which enabled the long lead bullet to rotate when it was launched, and the flight was stable after it was discharged, which improved the shooting accuracy and increased the range. The well-known French Minen front-loaded rifle weighs about 4.8kg and has four spiral rifles with a maximum range of 9 14m. The projectile is long, egg-shaped head, hollow bottom and slightly smaller caliber, which is easy to be loaded from the muzzle. When firing, gunpowder gas expands the bottom of the projectile and embeds the rifle to rotate. Because the front loading of this rifled gun is time-consuming, the spiral rifled gun was not widely used until the rear loading gun was really developed.