Marlin's used Ballard rifling some ...Micro-Groove some...from Winkypedia:
Marlin Firearms
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Marlin Firearms Company
Type Private
Founded 1870
Headquarters North Haven, Connecticut, USA
Industry Firearms
Products Firearms, weapons
Website
www.marlinfirearms.com
Marlin Model 60 22LR rifle manufactured in 1982
Marlin Model 1894C — .357 Magnum carbineThe Marlin Firearms Company of North Haven, Connecticut manufactures Marlin Rifles.
Over the company's 130+ years of firearms production, it has been best known for its manufacture of high power, center fire, lever action, and .22 caliber rim fire rifles. It has also made shot guns, that in many cases are the prized possessions in personal gun collections (many of which are of models that have been featured in such Hollywood movies as The Terminator and its sequels). It is the owner the firearm manufacturer H & R Firearms.
Contents [hide]
1 Products
2 MicroGroove Rifling
3 History
3.1 Early history
3.2 Newer history and leadership
3.3 Company expansion
4 See also
5 References
6 External links
[edit] Products
Major models of Marlin rifles include:
Marlin Model 1889 repeating rifle (featuring the 'Marlin Safety', the first side-ejecting cartridge mechanism)
Marlin Model 1895 Military Repeater
Marlin Model 25, a 22 Short, 22 Long, and 22 Long Rifle bolt-action rifle
Marlin Model 39A, lever action repeater, the longest continuously produced rifle in the world
Marlin Model 60, the most popular .22 LR caliber rifle in the world
Marlin Model 1894, lever action carbines in revolver calibers — .357 Magnum (1894C), .41 Magnum (1894FG), and .44 Magnum (1894SS or plain 1894)
Marlin Model 336, one of the most popular lever action hunting rifles in the world
Marlin Camp Carbine, a discontinued model
Marlin Model 70P "Papoose", a lightweight, magazine-fed, .22 LR carbine with a detachable barrel; it is designed to be taken down for easy transport while camping, backpacking, etc.
Significant variations of many of these rifles have usually also been manufactured. For example, there are 6 distinctly different variations currently manufactured for the Marlin Model 60.
[edit] MicroGroove Rifling
In 1953 Marlin Firearms was issued US Patent #3,100,358 for what was named MicroGroove Rifling which was a departure from the standard "Ballard" or cut rifling. The purpose of Microgroove Rifling was to increase the speed of producing rifle barrels.
Microgroove rifling is described in the patent as having 5 grooves for every 1/10th of an inch bore diameter, and that the driving side of each land would be "tangentially disposed" to prevent accumulating fouling in use.
Marlin introduced Microgroove rifling in their .22 rimfire barrels in July 1953, with 16 grooves that were .014" wide, and nominally .0015" deep. Ballard Rifled barrels have grooves generally in the range of .069-.090" wide, and .0015-.003" deep. This change was marketed in the 1954 Marlin catalog, as having numerous advantages that this new form of rifling had, including better accuracy, ease of cleaning, elimination of gas leakage, higher velocities and lower chamber pressures. The catalog also claimed that Microgroove Rifling did not distort the bullet jacket as deeply as Ballard Rifling hence improving accuracy.
Microgroove Rifles barrels have a reputation for accuracy problems with cast bullets due to the increased bore diameter generated by the shallow grooves. Use of oversized bullets has great effect on solving this problem, restoring accuracy to level seen from Ballard Rifled barrels. These grooves are inside the barrel and create more bullet spin. there is usually 16 groves in a standard 22 barrel. [1]
[edit] History