Is micro groove rifling good?
Micro-groove rifling is very effective and with jacketed or properly sized lead bullets will be as accurate as any traditionally cut or hammer forged barrel.
What is micro groove rifling?
Microgroove rifling is described in the patent as having 5 grooves for every 1/10 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 .
When did marlin make micro groove barrel?
On July 29, 1953, Marlin introduced Microgroove rifling in their . 22 rimfire barrels, with 16 grooves that were . 014″ wide, and nominally . 0015″ deep.
What is Marlin micro groove barrel?
Micro-Groove rifling on Marlin rifles, which consists of shallower but more numerous grooves than normal rifling, does a number of positive things all at once. First and most immediately, the shallower and more numerous grooves in Micro-Groove rifling cause the “lands” to be substantially narrower and less pronounced.
Is 5R rifling more accurate?
5R reduces projectile deformation as it passes through the bore during the firing sequence. More uniform projectile means better accuracy. Secondly, by sloping the transition to the groove, the barrels become much easier to clean.
How many grooves are in a microgroove barrel?
.35 caliber — 16 grooves, .040″ wide, and .002″ deep (this would be changed in 1968 to 12 grooves, .055″ wide, .0028″ deep) Note that by conventional standards, all of these grooves are fairly shallow. Microgroove rifling makes up for this by having many lands/grooves to grip and spin the bullet.
How many grooves does a Microgroove rifling have?
In this patent, Microgroove rifling was described 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” (i.e. beveled, presumably to prevent the accumulation of fouling).
Can a Microgroove rifling shoot cast bullets well?
There has been a great deal of concern over the years about whether or not Microgroove rifling would shoot cast bullets well.
What are the dimensions of a Marlin microgroove barrel?
Factory specifications for groove diameter is listed at .4107″, but these barrels sometimes run a little bit larger than this. In 1972, Marlin introduced the Model 1895 chambered in .45-70. Initially, these rifles were made with 8-groove Microgroove barrels, with grooves that were .060″ wide and .003″ deep.