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Long Range Hunting & Shooting
Help choosing a barrel length, contour and twist for a 300 Norma Magnum
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<blockquote data-quote="sable tireur" data-source="post: 1504685" data-attributes="member: 27307"><p>The world was shooting little tiny groups with 4- and 6-groove barrels long before Boots Obermeyer 'created' the 5R rifling style. So, in my opinion, the barrels will be equal in accuracy and barrel life. The 5R rifling tends to clean up a little easier and is less aggressive on thin bullet jackets.</p><p></p><p><em>"The 5r rifling concept is nothing new. It was developed by the Russians in WWII. Boots Obermeyer resurrected and refined it and now it is taking off in popularity because it has a couple of different advantages over the standard 6-groove rifling. The angle of the sides of the lands is one of the biggest differences...along with the fact that because there are 5 grooves instead of 6, no two grooves are directly opposite each other. One advantage is that there is less chance of bullet deformation (which can result in better accuracy), the other is in the fact that because of the angle of the sides of the lands, fouling doesn't accumulate nearly as much. That results in more sustained accuracy in situations where the barrel is subjected to more or less continuous firing over a long period of time without cleaning.....such as in a combat environment. The U.S. Army uses 5r barrels on the M24 platform, while the U.S. Marine Corps is still using a 6-groove rifling for the M-40 platform."</em></p></blockquote><p></p>
[QUOTE="sable tireur, post: 1504685, member: 27307"] The world was shooting little tiny groups with 4- and 6-groove barrels long before Boots Obermeyer 'created' the 5R rifling style. So, in my opinion, the barrels will be equal in accuracy and barrel life. The 5R rifling tends to clean up a little easier and is less aggressive on thin bullet jackets. [I]"The 5r rifling concept is nothing new. It was developed by the Russians in WWII. Boots Obermeyer resurrected and refined it and now it is taking off in popularity because it has a couple of different advantages over the standard 6-groove rifling. The angle of the sides of the lands is one of the biggest differences...along with the fact that because there are 5 grooves instead of 6, no two grooves are directly opposite each other. One advantage is that there is less chance of bullet deformation (which can result in better accuracy), the other is in the fact that because of the angle of the sides of the lands, fouling doesn't accumulate nearly as much. That results in more sustained accuracy in situations where the barrel is subjected to more or less continuous firing over a long period of time without cleaning.....such as in a combat environment. The U.S. Army uses 5r barrels on the M24 platform, while the U.S. Marine Corps is still using a 6-groove rifling for the M-40 platform."[/I] [/QUOTE]
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Help choosing a barrel length, contour and twist for a 300 Norma Magnum
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