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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Pac-Nor POLYGONAL rifling anyone?????
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<blockquote data-quote="mindcrime" data-source="post: 94159" data-attributes="member: 656"><p>[ QUOTE ]</p><p>Hi Guys i have a question about polygonal rifling which i hope some of you will be able to answer.</p><p></p><p>Firstly the Witworth barrel had a hexagonal bore and shot a tightly fitting hexagonal bullet to achieve its exceptional accuracy. </p><p>A conventional cylindrical bullet could be shot using this rifling, as long it was tightly patched to seal the bore but this way accuracy was mediocre.</p><p></p><p>I understand that polygonal rifling uses the 5 sides of the polygon to spin the bullet, therefore is the bore of the the polygonal rifled barrel smaller then bullet diameter? and does it swage down the bullet to take on the polygonal form in order to seal the barrel?</p><p></p><p>Alternatively, are the sides of the bore the same diameter as the bullet and pressure bumps up the bullet to seal the bore of the barrel? Thanks.</p><p></p><p>Ian. </p><p></p><p>[/ QUOTE ]</p><p></p><p><strong>Ian, I'm proud of you!!!</strong> /ubbthreads/images/graemlins/laugh.gif You know your cannon; either that or you looked it up on the net! /ubbthreads/images/graemlins/smirk.gif <a href="http://www.civilwarartillery.com/projectiles/rifled/IIIA140.htm" target="_blank">Here's what a 12 lb. Whitworth solid bolt looks like</a> <a href="http://www.civilwarartillery.com/cwimages/Whitworth.jpg" target="_blank">.....And here is what the 12 lb. breech loading Whitworth cannon itself looked like.</a> While you are totally correct about the projectiles having to be "poly'd" themselves, the Whitworth cannon has VERY AGGRESSIVE AND DEEP rifling relative to its bore size---I tried to find a picture of the muzzle to show you but I only have those pics in my Library, couldn't find them on the Net. I believe that the modern manufacturers are not even close to getting as aggressive as their predecessors. If they did we WOULD have to have a poly-projectile and H&amp;Ks barrels would be highly unsuccessful! /ubbthreads/images/graemlins/blush.gif </p><p></p><p>BTW, and JFYI, I am a Life Member of the "Heritage Not Hate" group Sons of Confederate Veterans, and a highly studied "Civil War" artillery enthuasist. /ubbthreads/images/graemlins/cool.gif Thus, "Sic Semper Tyrannus"</p></blockquote><p></p>
[QUOTE="mindcrime, post: 94159, member: 656"] [ QUOTE ] Hi Guys i have a question about polygonal rifling which i hope some of you will be able to answer. Firstly the Witworth barrel had a hexagonal bore and shot a tightly fitting hexagonal bullet to achieve its exceptional accuracy. A conventional cylindrical bullet could be shot using this rifling, as long it was tightly patched to seal the bore but this way accuracy was mediocre. I understand that polygonal rifling uses the 5 sides of the polygon to spin the bullet, therefore is the bore of the the polygonal rifled barrel smaller then bullet diameter? and does it swage down the bullet to take on the polygonal form in order to seal the barrel? Alternatively, are the sides of the bore the same diameter as the bullet and pressure bumps up the bullet to seal the bore of the barrel? Thanks. Ian. [/ QUOTE ] [b]Ian, I'm proud of you!!![/b] [img]/ubbthreads/images/graemlins/laugh.gif[/img] You know your cannon; either that or you looked it up on the net! [img]/ubbthreads/images/graemlins/smirk.gif[/img] [url="http://www.civilwarartillery.com/projectiles/rifled/IIIA140.htm"]Here's what a 12 lb. Whitworth solid bolt looks like[/url] [url="http://www.civilwarartillery.com/cwimages/Whitworth.jpg"].....And here is what the 12 lb. breech loading Whitworth cannon itself looked like.[/url] While you are totally correct about the projectiles having to be "poly'd" themselves, the Whitworth cannon has VERY AGGRESSIVE AND DEEP rifling relative to its bore size---I tried to find a picture of the muzzle to show you but I only have those pics in my Library, couldn't find them on the Net. I believe that the modern manufacturers are not even close to getting as aggressive as their predecessors. If they did we WOULD have to have a poly-projectile and H&Ks barrels would be highly unsuccessful! [img]/ubbthreads/images/graemlins/blush.gif[/img] BTW, and JFYI, I am a Life Member of the "Heritage Not Hate" group Sons of Confederate Veterans, and a highly studied "Civil War" artillery enthuasist. [img]/ubbthreads/images/graemlins/cool.gif[/img] Thus, "Sic Semper Tyrannus" [/QUOTE]
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Pac-Nor POLYGONAL rifling anyone?????
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