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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Long range barrel profile
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<blockquote data-quote="Bart B" data-source="post: 100487" data-attributes="member: 5302"><p>Lerch, yes, I remember about the fluting stuff. This issue is not about whether or not a skinny/whippy/light barrel is more rigid/stiff than a fat/heavy one. I already know that thicker ones for a given length are stiffer. </p><p></p><p>Give me a barrel's dimensions as well as whether it's 416 stainless or chome moly steel and I'll calculate what it's resonant (or fundamental) vibrating frequency is with one end held still and the other end free to vibrate; most are around 40 to 60 cycles per second (the answers may surprise folks). A mechanical engineer working with vibration problems for civil engineers' construction issues gave me the computer software (which I'll share with anyone who wants it). Here's an example:</p><p></p><p>Here's three 416 stainless steel barrels, .308-in. groove diameter, 30 inches long, screwed 1 inch into a receiver...</p><p>1.1-in. dia. for 2 in. from receiver, .7-in. muzzle diameter, 4.85 lb. mass, resonant frequency = 48.95 Hz</p><p>1.2-in. dia. for 2 in. from receiver, .8-in. muzzle diameter, 6.09 lb. mass, resonant frequency = 51.37 Hz</p><p>1.3-in. dia. for 2 in. from receiver, .9-in. muzzle diameter, 7.45 lb. mass, resonant frequency = 54.03 Hz</p><p>The thicker and stiffer they get the higher their resonant vibration frequency is.</p><p></p><p>This issue is about which barrel (stiff or whippy) is or can be most accurate. All I've stated is that there is no difference accuracy wise; both can shoot equally as good. But so many folks haven't quite understood that. Go back and read what I've said and you might understand what I'm talking about. I don't know how I can make it any simpler.</p></blockquote><p></p>
[QUOTE="Bart B, post: 100487, member: 5302"] Lerch, yes, I remember about the fluting stuff. This issue is not about whether or not a skinny/whippy/light barrel is more rigid/stiff than a fat/heavy one. I already know that thicker ones for a given length are stiffer. Give me a barrel's dimensions as well as whether it's 416 stainless or chome moly steel and I'll calculate what it's resonant (or fundamental) vibrating frequency is with one end held still and the other end free to vibrate; most are around 40 to 60 cycles per second (the answers may surprise folks). A mechanical engineer working with vibration problems for civil engineers' construction issues gave me the computer software (which I'll share with anyone who wants it). Here's an example: Here's three 416 stainless steel barrels, .308-in. groove diameter, 30 inches long, screwed 1 inch into a receiver... 1.1-in. dia. for 2 in. from receiver, .7-in. muzzle diameter, 4.85 lb. mass, resonant frequency = 48.95 Hz 1.2-in. dia. for 2 in. from receiver, .8-in. muzzle diameter, 6.09 lb. mass, resonant frequency = 51.37 Hz 1.3-in. dia. for 2 in. from receiver, .9-in. muzzle diameter, 7.45 lb. mass, resonant frequency = 54.03 Hz The thicker and stiffer they get the higher their resonant vibration frequency is. This issue is about which barrel (stiff or whippy) is or can be most accurate. All I've stated is that there is no difference accuracy wise; both can shoot equally as good. But so many folks haven't quite understood that. Go back and read what I've said and you might understand what I'm talking about. I don't know how I can make it any simpler. [/QUOTE]
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