In the early days of firearms, the majority of people were right-handed. As a result, it made sense to make guns that could be easily loaded and fired by right-handed shooters. Right-hand rifling allowed the bullet to spin clockwise, which created more stability and accuracy.
Another practical reason for right-handed rifling is that it helps to prevent jamming. When a bullet is fired, the gunpowder explodes and creates a high-pressure gas that propels the bullet down the barrel. This gas can also cause the bullet to wobble, which can lead to jamming. Right-hand rifling helps to stabilize the bullet and prevent it from wobbling.
There are some exceptions to the rule of right-hand rifling. Some guns, such as the AK-47, have left-hand rifling. This is because the AK-47 was originally designed for use by the Soviet military, who preferred left-hand rifling. There are also some right-handed shooters who prefer to use left-hand rifling. This is often due to personal preference or because they have a medical condition that makes it difficult to use right-hand rifles.
Ultimately, the choice of whether to use right-hand or left-hand rifling is a personal one. There are pros and cons to both options, and the best choice for each individual shooter may vary.