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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Thoughts on preferred barrel blanks barrels with 5 r rifling
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<blockquote data-quote="Coyote Shadow Tracker" data-source="post: 2142307" data-attributes="member: 116439"><p>Interesting. I have went through PBB website and their barrels are "Button Stress Relieved" They describe their drilling, but not much on the rifling process or # lands/grooves. 5R is a 5-groove rifling pattern with sloped or angled sides to the lands. All rifling has a certain amount of angle to the sides of the lands as a natural effect of the rifling process. The sides of the grooves are parallel, but the sides of the lands are not and the 5R Cut carries this to an extreme. Manufacturers are using the "5R" label on both hammer-forged and button-rifled barrels.</p><p></p><p>The "R" comes from Russian origin.</p><p></p><p>5R is an improvement over conventional rifling by changing the shape and configuration of the lands and grooves. Conventional rifling, while effective, can be improved upon in two ways.</p><p></p><ul> <li data-xf-list-type="ul">1. Conventional rifling has sharp 90-degree corners from the top of the land to the bottom of the groove.</li> <li data-xf-list-type="ul">2.Conventional rifling has lands and grooves opposing one another.</li> </ul><p>5R rifling improves upon this by using 5 lands and grooves over the even numbers which puts lands opposite of grooves. Further, the transition from the top of the land to the groove is sloped.</p><p></p><p>5R reduces projectile deformation as it passes through the bore during the firing sequence. By placing the lands opposite of the grooves, the bullets are no longer squeezed on opposite sides ensuring the projectile stays uniform instead of squeezing material into the grooves. More uniform projectile means better accuracy.</p><p></p><p>Secondly, by sloping the transition to the groove, the barrels become much easier to clean. In a conventionally rifled platform, these corners become depositories for lead and superheated materials left after shooting. Cleaning supplies have a hard time reaching these corners as they are incredibly small. By sloping it, cleaning supplies are easily able to get to the deposits.</p><p></p><p><strong>Does this mean conventional rifling is no good or which is better?</strong></p><p></p><p>Absolutely not! Conventional rifling has been slinging projectiles accurately for over 200 years and will continue to be used in match and hunting rifles.</p></blockquote><p></p>
[QUOTE="Coyote Shadow Tracker, post: 2142307, member: 116439"] Interesting. I have went through PBB website and their barrels are "Button Stress Relieved" They describe their drilling, but not much on the rifling process or # lands/grooves. 5R is a 5-groove rifling pattern with sloped or angled sides to the lands. All rifling has a certain amount of angle to the sides of the lands as a natural effect of the rifling process. The sides of the grooves are parallel, but the sides of the lands are not and the 5R Cut carries this to an extreme. Manufacturers are using the "5R" label on both hammer-forged and button-rifled barrels. The ”R” comes from Russian origin. 5R is an improvement over conventional rifling by changing the shape and configuration of the lands and grooves. Conventional rifling, while effective, can be improved upon in two ways. [LIST] [*]1. Conventional rifling has sharp 90-degree corners from the top of the land to the bottom of the groove. [*]2.Conventional rifling has lands and grooves opposing one another. [/LIST] 5R rifling improves upon this by using 5 lands and grooves over the even numbers which puts lands opposite of grooves. Further, the transition from the top of the land to the groove is sloped. 5R reduces projectile deformation as it passes through the bore during the firing sequence. By placing the lands opposite of the grooves, the bullets are no longer squeezed on opposite sides ensuring the projectile stays uniform instead of squeezing material into the grooves. More uniform projectile means better accuracy. Secondly, by sloping the transition to the groove, the barrels become much easier to clean. In a conventionally rifled platform, these corners become depositories for lead and superheated materials left after shooting. Cleaning supplies have a hard time reaching these corners as they are incredibly small. By sloping it, cleaning supplies are easily able to get to the deposits. [B]Does this mean conventional rifling is no good or which is better?[/B] Absolutely not! Conventional rifling has been slinging projectiles accurately for over 200 years and will continue to be used in match and hunting rifles. [/QUOTE]
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Thoughts on preferred barrel blanks barrels with 5 r rifling
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