Not sure when they went from micro-groove to Ballard type but they went to micro-groove rifling around 1954,a 1 in 38 twist is standard for most .44 Magnum &.444 but with some ammo makers making factory loads that use bullets that weigh more then 240grns. in weight buy a Ruger Deerfield simi-auto .44 magnum or their lever action .44 magnums because they have a rifling twist of 1 in 18 that will stabilize the heavier 300grn.plus bullets and don't use the micro-groove rifling,also leading can be a problem in micro-groove barrels if your using soft lead and load them to more then 1200 feet per second so for that reason your better off to stick with jacketed bullets of not more then 240 grains when loading ammo for rifles with micro-groove barrels with the 1-38 twist if your going to be using heavy loads.Hope this info can be of some help to somebody, I have also noticed that the Ruger Deerfield rifle with the faster rifling twist gives a better bullet mushroom as opposed to the old 1-38 twist.If you'd like to learn a little more about this fascinating topic,type rifling characteristics into a search with Google and you will find a lot of interesting information on different types of rifling used by different manufacturers.
New .444's now have a 1 in 20 twist. I hope they do the same in the .44 Mag soon. The 1 in 20 will stabilize 300 grain bullets while the 1 in 38 will not.
1953 Check the article at wikipedia for more.
Marlin switched from Ballard rifling to the newer micro-groove on their 81 DL model in 1954.
It is Ballard style rifling, and should date to 1999. The year of manufacture is 2001. 1st 2 digits of serial # correspond to the year it was made. Ballard rifling is correct.
most likely it is. marlin (glenfield is marlin) began using micro-grove technology in 1953.
the micro groove is button cut and ballard is the lands and grooves are not equally spaced
He was rifling through his folders to find an important paper.
The rifling is there to spin the bullet, which gives greater accuracy.
rifling is the spiral that is engraved into the barrel to put spin on the bullet which improves distance and accuracy.
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When rifled, the rifling tool cuts the GROOVES. Material left between the grooves is the LANDS.
Rifling was invented in the late 15th century. It was improved by August Kotter of Nuremberg in 1520 and by others later. There is a link below.
Rifling is the spiral groove pattern in a rifle or handgun barrel the purpose of which is to impart spin to the bullet in order to achieve stability in flight.
Direction of spin is dependent on the direction of the rifling on the inside bore of the barrel. A bullet will spin the same direction as the rifling.
The rifling in a firearm is designed to cause the project (bullet) to spin, increase stability and accuracy.
The barrels of Glock pistols use a different style of rifling, known as polygonal rifling. When shooting cast bullets, this rifling will get smeared with lead (known as "leading up"), and the pistol becomes unsafe to shoot.
Inside the barrel.
In the mid 1400s
Generally a smoothbore weapon, some rifledbore flintlock pistols were produced. The smoothbore were easier to make and mass produce at a faster rate.
A shotgun barrel with rifling.
Moisture, range, no rifling.
Can be hammer forged, cut or drawn.
Fifteenth century by Jaspard Zoller.
Lands and grooves.
A process of putting rifling in a barrel.