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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Lija 1:7 30cal
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<blockquote data-quote="NEMTHunter" data-source="post: 1624403" data-attributes="member: 77631"><p>Mine finishes @ 1:7.5 Kind of with I would have gone down to a 1:7 twist. But for the bullets made currently a 7.5 will be more then enough. My next one will be a 1:7 5R though. There comes a point when all you do is over spin the bullet. </p><p></p><p>Also depending on how fast you shoot the bullet a tight twist could have a adverse affect. Why? The bullet might have to much forward momentum depending on the bearing surface (not enough), type of twist, Or to thin of jacket for the bullet to properly grip the rifling. What this will do is smear the bullet down the bore and give you bad results even though you have the right twist for the bullet.</p><p></p><p>Think on it like this. Say you have a bullet thats stable at 2800 fps and hits the target point first. But as you pick up speed and get closer or above 3000 fps you loose stability. What is causing this? Since we know more speed means more RPM of the bullet and that increases stability. I have a theory what as speed picks up it becomes unstable.</p><p></p><p>Some of it could be the fact the bullet is not able to grip the bore as needed so it is pushing through the rifling. TO move force pushing the bullet into a tight twist for it to be able to grip the rifling. A short bearing surface from light engraving pressure or a super short bearing surface. A thin jacket I feel could do the same thing. Unless the bullet hits and grips you will have trouble and speed will keep that from taking place.</p><p></p><p>Just some thoughts I have had.</p></blockquote><p></p>
[QUOTE="NEMTHunter, post: 1624403, member: 77631"] Mine finishes @ 1:7.5 Kind of with I would have gone down to a 1:7 twist. But for the bullets made currently a 7.5 will be more then enough. My next one will be a 1:7 5R though. There comes a point when all you do is over spin the bullet. Also depending on how fast you shoot the bullet a tight twist could have a adverse affect. Why? The bullet might have to much forward momentum depending on the bearing surface (not enough), type of twist, Or to thin of jacket for the bullet to properly grip the rifling. What this will do is smear the bullet down the bore and give you bad results even though you have the right twist for the bullet. Think on it like this. Say you have a bullet thats stable at 2800 fps and hits the target point first. But as you pick up speed and get closer or above 3000 fps you loose stability. What is causing this? Since we know more speed means more RPM of the bullet and that increases stability. I have a theory what as speed picks up it becomes unstable. Some of it could be the fact the bullet is not able to grip the bore as needed so it is pushing through the rifling. TO move force pushing the bullet into a tight twist for it to be able to grip the rifling. A short bearing surface from light engraving pressure or a super short bearing surface. A thin jacket I feel could do the same thing. Unless the bullet hits and grips you will have trouble and speed will keep that from taking place. Just some thoughts I have had. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Lija 1:7 30cal
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