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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Does fluting affect barrel accuracy?
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<blockquote data-quote="Bart B" data-source="post: 666402" data-attributes="member: 5302"><p>'Tis not a theory; it's reality.</p><p></p><p>Some years ago an article in a rifle magazine explained it. Bead blasting creates more surface area than fluting a barrel. May not seem that way, but those micro sized mountains and valleys actually transfer more heat off the barrel than fluting does. Only 10% or so, but enough to be measured. The coarser the beads are, the more surface area will be attained.</p><p></p><p>I'm not one to worry about barrels heating up. Even shooting 1 shot every 5 seconds putting 10 rounds down range doesn't change point of impact if the barrel's made and fit correctly. They've got to be properly stress relieved and fit to receivers whose face has been squared with the barrel tenon thread axis. Folks have put 20 to 40 shots downrange about 20 seconds apart starting with a cold barrel and easily put all under 1/2 MOA at 600 to 1000 yards. Lake City Army Ammo Plant shoots a couple hundred rounds of M118 match ammo for accuracy tests fired about 20 to 30 seconds apart and good lots of ammo would shoot about 1 MOA at 600 yards; at 100 yards it would shoot about 1/3 MOA.</p><p></p><p>Factory rifles rarely, if ever, have squared up receiver faces; their barrels have one hard contact point around the barrel shoulder and when they expand from heat, stress at that point tends to make the barrel bend more in that general direction while the bullet goes through it.</p><p></p><p>The only bad thing about hot barrels is if the chambered round stays in more than 20 seconds seconds before its shot, the powder has heated up and muzzle velocity will be a bit faster and bullets will strike a bit high. </p><p></p><p>Good site on barrel fluting: <a href="http://www.snipercountry.com/articles/realbenefitsbarrelfluting.asp" target="_blank">The Real Benefits of Barrel Fluting</a></p><p></p><p>The cooling effects of bead blasting can be found in several web sites; search for "bead blasting barrel cooling" and pick one that's related to rifle barrels.</p></blockquote><p></p>
[QUOTE="Bart B, post: 666402, member: 5302"] 'Tis not a theory; it's reality. Some years ago an article in a rifle magazine explained it. Bead blasting creates more surface area than fluting a barrel. May not seem that way, but those micro sized mountains and valleys actually transfer more heat off the barrel than fluting does. Only 10% or so, but enough to be measured. The coarser the beads are, the more surface area will be attained. I'm not one to worry about barrels heating up. Even shooting 1 shot every 5 seconds putting 10 rounds down range doesn't change point of impact if the barrel's made and fit correctly. They've got to be properly stress relieved and fit to receivers whose face has been squared with the barrel tenon thread axis. Folks have put 20 to 40 shots downrange about 20 seconds apart starting with a cold barrel and easily put all under 1/2 MOA at 600 to 1000 yards. Lake City Army Ammo Plant shoots a couple hundred rounds of M118 match ammo for accuracy tests fired about 20 to 30 seconds apart and good lots of ammo would shoot about 1 MOA at 600 yards; at 100 yards it would shoot about 1/3 MOA. Factory rifles rarely, if ever, have squared up receiver faces; their barrels have one hard contact point around the barrel shoulder and when they expand from heat, stress at that point tends to make the barrel bend more in that general direction while the bullet goes through it. The only bad thing about hot barrels is if the chambered round stays in more than 20 seconds seconds before its shot, the powder has heated up and muzzle velocity will be a bit faster and bullets will strike a bit high. Good site on barrel fluting: [url=http://www.snipercountry.com/articles/realbenefitsbarrelfluting.asp]The Real Benefits of Barrel Fluting[/url] The cooling effects of bead blasting can be found in several web sites; search for "bead blasting barrel cooling" and pick one that's related to rifle barrels. [/QUOTE]
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Does fluting affect barrel accuracy?
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