Grooves

[Glock 25]

Grooves can effect on the Effective Range of HANDGUN. Example 32 Acp callibeer Handgun. 1St gun 4 Grooves RH Twist, 2nd 6 Grooves RH Twist, Which Firinge Range( Effective Range) are Higher. Firinge load are same 71 graing any BUllet. Kindly answer me.

[captrakshitsharma]

Barrel length?

[dr.jayakumar]

i doubt it will effect the range.but sure will effect the penetration.
regards
dr.jk

[Georgian21]

If the barrel lengths for both the guns are same, the range of the second one will be bit higher due to revolution earned and dissipated while in motion.

Regards
Gopal

[brihacharan]

Hi Guys,
> Here are a few points worth knowing

RIFLING / GROOVING

The concept & practice of rifling / grooving a pistol / revolver / rifle barrel is primarily done to enhance the ‘Ballistic Coefficient’ of the projectile (bullet) during its flight, thus giving it the property to resist the gravitational pull during its flight.

This helps the bullet to travel in as straight a trajectory as possible. The spin provided by the rifling / grooving provides the ballast to maintain the flight path of the bullet along with accuracy.

All pistols, revolvers & rifles barrels have what are called rifling / grooves in their barrels. Rifling consists of grooves cut or formed in a spiral nature, lengthwise down the barrel of a firearm.

Rifling is placed in the barrels of firearms to impart a spin on the bullets that pass through it. Because bullets are oblong objects, they must spin in their flight, to be accurate. Looking down the barrel of a firearm you might see rifling containing four / six grooves with a right twist.

In firearm parlance we refer to the rifling as lands & grooves. The lands are the raised areas between two grooves. Firearms can be manufactured with any number of lands and grooves in their barrels. They can also spiral either left or right. A few of the more common rifling patterns are 4/right, 5/right, 6/right, 6/left, 8/right, and 16/right.

When barrels are manufactured, they start out as a solid rod of steel. A hole is drilled down the center of the rod and the rifling is then placed in the barrel.

There are three basic machining processes that modern firearms manufacturers use to form the rifling in barrels. Rifling can be cut into the inner surface of a barrel using a broach, the rifling can be formed using a hardened steel button, or the rifling will be formed through a process called hammer forging. A newer method of rifling barrels, called Electrochemical Rifling, does not involve the normal machining processes of the other techniques.

BROACH RIFLING

•The modern broach method of rifling uses a hardened steel rod with several cutting rings spaced down the steel rod. Like the one shown below. Broaches can be over 16 inches long and because they have several cutting rings, they are referred to as gang broaches.

•Each successive cutting ring is slightly larger in diameter and when the last ring on the broach passes down the barrel the desired depth to the grooves is obtained. The cutting rings have gaps evenly spaced around them to allow for the lands. The rod is twisted as it is pulled through the barrel and this forms the spiral to the rifling pattern. A cut-away of the inside of a barrel below shows the cut grooves and the lands with original drilling marks.

BUTTON RIFLING

•Probably the most common method used today to rifle barrels is button rifling. Button rifling uses a different approach to forming the grooves in the barrel. A button is a very hard steel plug that is forced down an unrifled barrel. The grooves are then formed in the barrel under very high pressure. The pressure created to form the rifling in the barrel hardens and polishes the inside of the barrel.

HAMMER FORGED RIFLING

•The newest mechanical method of rifling barrels is accomplished through a process called hammer forging. A hardened steel mandrel is produced with the shape of the rifling formed on its outer surface. The mandrel is inserted into a barrel blank and the outer surface of the barrel is machine hammered. The hammering forces the barrel material down against the mandrel and the inner surface of the barrel takes on the shape of the mandrel. The mandrel is then removed from the barrel and the outer surface of the barrel is cleaned up. Just as in the other types of rifling, polygonal rifling can have different patterns. This form of rifling is used by GLOCK, STEYR, IMI, and a few other manufacturers.

ELECTROCHEMICAL RIFLING

•In a process that eliminates the conventional machining of metal, rifling is formed by wet-etching the interior of a barrel under an electric current. The metal inside the barrel is actually eaten away or dissolved to create grooves in the barrel. An electrode (cathode) that has metal strips in the shape of the rifling is placed in the barrel (anode) and the assembly is submerged in a salt solution. An electric current is applied and the electrode is moved down the length of the barrel and twisted to create the spiral shaped grooves. As the current travels from the barrel to the electrode metal is removed by electrolysis thus forming the grooves in the barrel. This process creates the rifling in the barrel very quickly and does not require consumable tooling.

•Both broach and button rifling are considered conventional rifling techniques. The transition from a land to a groove is very distinct and the lands and grooves are flat & being slightly curved.

•Electrochemical rifling is more similar in shape to the button and broach rifled barrels but has slightly less distinct transitions between the lands and grooves.

> BTW the length of the barrel does to an extent contribute to maximize the effective range of the weapon.
Briha