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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
MYTH or FACT (velocity difference in rifling)
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<blockquote data-quote="Bart B" data-source="post: 569142" data-attributes="member: 5302"><p>There may well be a difference in muzzle velocity with different rifling types for the same barrel length and groove diameter when the same rifle and chambering reamer is used. Unless the comparison is realistic and only one thing changes (rifling type and nothing else), any answer one gets is probably flawed. It takes more force to push a bullet into 6 grooves than any lesser number with the same bore and groove diameter as well as rifling shape with only the width of the lands being different. Which means there'll be more chamber pressure as the powder starts burning and that may well result in a slightly higher muzzle velocity</p><p></p><p>I've seen 3 groove barrels shoot just as accurate as those with 4, 5 or 6 grooves. I'm referring to those that will shoot bullets under 4 inches all day long at 600 yards. Therefore I don't believe that the number of grooves matters.</p><p></p><p>But there seems to be a difference in accuracy for a given bullet caliber and shape when fired through 4 or 6 groove barrels. Best example is Sierra's 155-gr. Palma bullet which seems to do best with 4 groove barrels. When it came out in 1991, folks with 6 groove barrels didn't shoot it as accurate as those with 4 groove barrels. </p><p></p><p>I find it hard to believe that anyone would claim that a 4 groove barrel would compress and/or reshape bullets such that they wouldn't shoot accurate. One would have to measure normally fired bullets (undamaged by impact in whatever they're caught in) to find out if they did change. 4 groove barrels have been in so many very accurate, match winning and record setting events so anyone knowing of this would believe there's nothing wrong with them. So in my opinion, anyone thinking 4 grooves ain't good for accuracy has been doing the wrong stuff to learn the difference.</p><p></p><p>Any difference between rifling types won't be enough to loose sleep over. However, folks wanting the fastes bullet speed possible as their top priority may be able to get one. If 50 fps more muzzle velocity is attainable with a 10% loss of accuracy, such is life.</p></blockquote><p></p>
[QUOTE="Bart B, post: 569142, member: 5302"] There may well be a difference in muzzle velocity with different rifling types for the same barrel length and groove diameter when the same rifle and chambering reamer is used. Unless the comparison is realistic and only one thing changes (rifling type and nothing else), any answer one gets is probably flawed. It takes more force to push a bullet into 6 grooves than any lesser number with the same bore and groove diameter as well as rifling shape with only the width of the lands being different. Which means there'll be more chamber pressure as the powder starts burning and that may well result in a slightly higher muzzle velocity I've seen 3 groove barrels shoot just as accurate as those with 4, 5 or 6 grooves. I'm referring to those that will shoot bullets under 4 inches all day long at 600 yards. Therefore I don't believe that the number of grooves matters. But there seems to be a difference in accuracy for a given bullet caliber and shape when fired through 4 or 6 groove barrels. Best example is Sierra's 155-gr. Palma bullet which seems to do best with 4 groove barrels. When it came out in 1991, folks with 6 groove barrels didn't shoot it as accurate as those with 4 groove barrels. I find it hard to believe that anyone would claim that a 4 groove barrel would compress and/or reshape bullets such that they wouldn't shoot accurate. One would have to measure normally fired bullets (undamaged by impact in whatever they're caught in) to find out if they did change. 4 groove barrels have been in so many very accurate, match winning and record setting events so anyone knowing of this would believe there's nothing wrong with them. So in my opinion, anyone thinking 4 grooves ain't good for accuracy has been doing the wrong stuff to learn the difference. Any difference between rifling types won't be enough to loose sleep over. However, folks wanting the fastes bullet speed possible as their top priority may be able to get one. If 50 fps more muzzle velocity is attainable with a 10% loss of accuracy, such is life. [/QUOTE]
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MYTH or FACT (velocity difference in rifling)
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