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Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
Mystery spiral on 223 bullet?
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<blockquote data-quote="Tesoro" data-source="post: 1291267" data-attributes="member: 44340"><p>Well I think I got to the bottom of this 'mystery'! This am I called WOA and got speak to the man himself - John Holliger.</p><p>He said that those spirals are not uncommon to see and have to be caused by an unexplained spin to the cartridge with contact in the chamber during the violent chambering process. He said that the cartridge is already on its way into the chamber before the bolt catches up with it. ie when the bolt slams into a cartridge and strips it off the mag it actually pops it forward and then catches up with it to slam it into place. Somewhere during the nano second of free flight the cartridge can spin as evidenced by the spiral lines on bullets. This makes sense to me. I wonder if maybe the spring pressure exerted on one side of the cartridge in the mag before it is stripped causes this?</p><p></p><p>Also he said that if there was a 'burr' in the throat then the rifle flat out wouldnt shoot and you would know it. </p><p></p><p>I will bet that if you soft load a round off a mag and push it into place and then eject it you wont see any spiral marks. But if you slam it into place then you would/could get the spirals like I experienced. I also noticed that there were more spirals (more spin) on a cartridge loaded by firing than by releasing the bolt catch. ie the bolt slams home harder during firing than by manual release and somehow imparts more spin.</p><p></p><p>if I could have taken a better pic of the evenly spaced 3 line spiral scratch on the bullet you all could have appreciated it better...could only be caused by the bullet rubbing on something and making 3 spins as it passed by it.</p><p></p><p></p><p>This is some pretty nit picky stuff here but hey when I see some weird mark on my rifle mechanics or cartridge I want to know what caused it!! live n learn. No magic!</p></blockquote><p></p>
[QUOTE="Tesoro, post: 1291267, member: 44340"] Well I think I got to the bottom of this 'mystery'! This am I called WOA and got speak to the man himself - John Holliger. He said that those spirals are not uncommon to see and have to be caused by an unexplained spin to the cartridge with contact in the chamber during the violent chambering process. He said that the cartridge is already on its way into the chamber before the bolt catches up with it. ie when the bolt slams into a cartridge and strips it off the mag it actually pops it forward and then catches up with it to slam it into place. Somewhere during the nano second of free flight the cartridge can spin as evidenced by the spiral lines on bullets. This makes sense to me. I wonder if maybe the spring pressure exerted on one side of the cartridge in the mag before it is stripped causes this? Also he said that if there was a 'burr' in the throat then the rifle flat out wouldnt shoot and you would know it. I will bet that if you soft load a round off a mag and push it into place and then eject it you wont see any spiral marks. But if you slam it into place then you would/could get the spirals like I experienced. I also noticed that there were more spirals (more spin) on a cartridge loaded by firing than by releasing the bolt catch. ie the bolt slams home harder during firing than by manual release and somehow imparts more spin. if I could have taken a better pic of the evenly spaced 3 line spiral scratch on the bullet you all could have appreciated it better...could only be caused by the bullet rubbing on something and making 3 spins as it passed by it. This is some pretty nit picky stuff here but hey when I see some weird mark on my rifle mechanics or cartridge I want to know what caused it!! live n learn. No magic! [/QUOTE]
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AR15/10 Rifles
Mystery spiral on 223 bullet?
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