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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
What difference does the groove count make in a barrel?
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<blockquote data-quote="BryanLitz" data-source="post: 301052" data-attributes="member: 7848"><p>Although I agree with Michael that wider lands stand to last longer than narrower lands, there is a potential downside of wide lands, especially for overbore cartridges like the 6mm-284.</p><p></p><p>Kirby Allen explained this one time as 'Bearing Surface Compression' (BSC). The idea is that wider lands compress a greater percentage of the bullet's circumference, putting more abuse (heat/friction) on the bullet. Kirby uses the percentage of BSC as an indicator of how likely a bullet is to survive when fired from an overbore cartridge. (Kirby, please step in here and correct me if I'm misrepresenting your ideas).</p><p></p><p>So wide lands may stand to add life to your barrel, but they may be more likely to end life for your bullets. Of course if you're not dealing with an overbore cartridge and bullet failure is not a consideration, then you'll have the longevity advantages of the wide lands without the downside of bullet failure.</p><p></p><p>Take care,</p><p>-Bryan</p></blockquote><p></p>
[QUOTE="BryanLitz, post: 301052, member: 7848"] Although I agree with Michael that wider lands stand to last longer than narrower lands, there is a potential downside of wide lands, especially for overbore cartridges like the 6mm-284. Kirby Allen explained this one time as 'Bearing Surface Compression' (BSC). The idea is that wider lands compress a greater percentage of the bullet's circumference, putting more abuse (heat/friction) on the bullet. Kirby uses the percentage of BSC as an indicator of how likely a bullet is to survive when fired from an overbore cartridge. (Kirby, please step in here and correct me if I'm misrepresenting your ideas). So wide lands may stand to add life to your barrel, but they may be more likely to end life for your bullets. Of course if you're not dealing with an overbore cartridge and bullet failure is not a consideration, then you'll have the longevity advantages of the wide lands without the downside of bullet failure. Take care, -Bryan [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
What difference does the groove count make in a barrel?
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