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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Bore Capacity versus Barrel Life
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<blockquote data-quote="Bart B" data-source="post: 1154443" data-attributes="member: 5302"><p>coyotezapper,</p><p></p><p>Someone's comments on Sniper magazine article in 6/13 by Todd Hodnett. "...has been doing testing on twist rate for quite some time now, granted it has been with 338LM and the 308. ...he has found that buy going faster the more accurate a gun can be at long range. .... referring to his test using a 308 168gr factory match grade ammunition and getting consistent hits with a "14-inch barrel and an 1:8 twist. It had no problem hitting the target multiple times at a mile" </p><p></p><p>"He also addressed the concerns about barrel life and spinning jackets off. Some have theorized the faster twist would shorten barrel life. According to Hodnett his 308 with a 1:7.8 twist had 14,000 before he changed the barrel. Oh and he is not a believer of removing all the copper from the barrel after each session. In fact he won't do a copper removal at all unless he sees accuracy starting to diminish."</p><p></p><p>Zero info's provided to qualify those remarks about accuracy. To say nothing of the fact the ammo's going to have about a 36 inch drift at a mile with a constant 1 mph cross wind throughout its trajectory; that never happens. What about the target size? I oft times apply the "GB" standard to such claims. A Greyhound Bus has an area 31,000 times bigger than a Golf Ball; where in that bandwidth was his target size? And how many out of a Gross of Bullets (144 of 'em) will hit the desired target size?</p><p></p><p>And those bullets go subsonic at about 1000 yards.</p><p></p><p>What's the angle of the rifling to bullets in a 30 caliber 1:7.8 twist barrel? How does it compare to the same twist in a 22 caliber barrel? </p><p></p><p>Such claims are impressive to some folks. Not me. Hodnett provides no conditions and standards whatsoever for his claims to be based on. Sheepskin marketing; he's pulling the wool over someone's eyes.</p></blockquote><p></p>
[QUOTE="Bart B, post: 1154443, member: 5302"] coyotezapper, Someone’s comments on Sniper magazine article in 6/13 by Todd Hodnett. “...has been doing testing on twist rate for quite some time now, granted it has been with 338LM and the 308. ...he has found that buy going faster the more accurate a gun can be at long range. .... referring to his test using a 308 168gr factory match grade ammunition and getting consistent hits with a “14-inch barrel and an 1:8 twist. It had no problem hitting the target multiple times at a mile” “He also addressed the concerns about barrel life and spinning jackets off. Some have theorized the faster twist would shorten barrel life. According to Hodnett his 308 with a 1:7.8 twist had 14,000 before he changed the barrel. Oh and he is not a believer of removing all the copper from the barrel after each session. In fact he won’t do a copper removal at all unless he sees accuracy starting to diminish.” Zero info’s provided to qualify those remarks about accuracy. To say nothing of the fact the ammo’s going to have about a 36 inch drift at a mile with a constant 1 mph cross wind throughout its trajectory; that never happens. What about the target size? I oft times apply the “GB” standard to such claims. A Greyhound Bus has an area 31,000 times bigger than a Golf Ball; where in that bandwidth was his target size? And how many out of a Gross of Bullets (144 of 'em) will hit the desired target size? And those bullets go subsonic at about 1000 yards. What's the angle of the rifling to bullets in a 30 caliber 1:7.8 twist barrel? How does it compare to the same twist in a 22 caliber barrel? Such claims are impressive to some folks. Not me. Hodnett provides no conditions and standards whatsoever for his claims to be based on. Sheepskin marketing; he’s pulling the wool over someone’s eyes. [/QUOTE]
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Bore Capacity versus Barrel Life
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